What does the command show | compare rollback 1 display?

What does the command show | compare rollback 1 display?

A.
the difference between the current candidate configuration and the candidate configuration from
one commit ago

B.
the difference between the current active configuration and the current candidate configuration

C.
the difference between the current active configuration and the active configuration from one
commit ago

D.
the difference between the current candidate configuration and the archived configuration from
one commit ago