Which two statements about LDP advertising when Explicit Null is in effect are true?

Which two statements about LDP advertising when Explicit Null is in effect are true? (Choose two.)

A.
Penultimate hop popping is disabled.

B.
Penultimate hop popping is enabled.

C.
It is the default behavior for LDP.

D.
It is used for the advertisement of static routes.

E.
It is used for the advertisement of connected routes.