Any form of heat transfer by radiation (in vacuum and also in air) goes via electromagnetic waves typically infrared radiation. Of course the sun has a very wide spectrum not only restricted to the IR range.

Dr Fritz Caspers thank you for your contribution to the discussion

The core, radiative zone and convection zone are the three inner layers. The nuclear reactions in the core produce plasmatic energy. This energy transfers inside the radiative zone as photon emission through radiation. The differential rotation of the radiative zone passes through the convection zone. A convection zone, convective zone or convective region of a star is a layer which is unstable due to convection. Energy is primarily or partially transported by convection in such a region. In a radiation zone, energy is transported by radiation and conduction. The Radiative Zone - Energy moves slowly outward, taking more than 170,000 years to radiate through this layer of the Sun. The Convection Zone - Energy continues to move toward the surface through convection currents of the heated and cooled gas.The difference between the radiation zone and the convection zone is as follows: The radiation zone of the Sun is the interior region of the sun, or the core of the Sun, from where the energy is generated due to fusion. The convection zone is the outermost inner layer above the radiation zone. Energy is transferred from the sun to Earth via electromagnetic waves, or radiation. Most of the energy that passes through the upper atmosphere and reaches Earth's surface is in two forms, visible and infrared light. The majority of this light is in the visible spectrum. The radiative zone of the sun surrounds the core. The temperature of the radiative zone ranges from about 2,000,000ºC to 7,000,000 ºC. In the radiative zone, energy moves outward in the form of electromagnetic waves, or radiation. This is a slow process since each re-emission is in new and random directions. The radiative zone begins about 25% of the way out from the Sun's center and extends to 0.7 Solar radii, and it can take a photon more than 50,000 years to traverse this distance. The interior layer of the Sun includes the core, radiative zone, and convective zone. The photosphere is the surface layer of the Sun, and the solar atmosphere includes the chromosphere and corona. Option 3 is correct, i.e. Radiation. Solar energy, in the form of heat and light, travels from the sun to Earth through the process of radiation. The Sun is the principal source of energy on the Earth's surface. It is like a powerhouse who generates and gives out energy in the form of light and heat. This energy constantly emitted by the sun is known as solar energy. Electromagnetic energy is radiant energy that travels in waves at the speed of light. It can also be described as radiant energy, electromagnetic radiation, electromagnetic waves, light, or the movement of radiation. Energy from the Sun is the driver of many Earth System processes. This energy flows into the Atmosphere and heats this system up It also heats up the Hydrosphere and the land surface of the Geosphere, and fuels many processes in the Biosphere.