What is meant by a two$-$level name in SAS?

Question $10$Select one:

a$.$

A name that describes your program and dataset name

b$.$

A name that describes a SAS dataset but not the library it is saved in

c$.$

A name that describes the author in the header of the file

d$.$

A name that connects the SAS session to a library

e$.$

A name that describes the library and dataset name