What are three heirs of ROme after the fall of the Western Empire?

Question

I think I know two, which are...Byzantine and Islamic. But what is the last one??
or is my two answer right??

Answer 1

is the last one Latin west???

Answer 2

In my note, i wrote latin west and western europe. Are these to mean the same thing??

Answer 3

I don't think the Islamic Empire was an heir to the Roman Empire.

To me these three heirs are the Byzantine Empire, Western Europe, and the Roman Catholic Church.