Literary research focuses on various aspects of literature, primarily written literature, like books, and its interpretation.

In my opinion all these categories.

It is research into various genres of literature, an analysis of themes and patterns as well as nuances. It could also be a comparison (or contrast) of different styles of writing by different writers in the same genre. It also looks for hidden meanings contextually.

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It focuses on what other researchers have done in relation to your research in question. It helps you to know whether your are the first researcher to handle such area or not. Doing this enables you to know the gabs or faults or what other researchers could not handle in the related area or field of study.