Which two are prerequisites for configuring flashback d…

Which two are prerequisites for configuring flashback database for Oracle 12c databases, in a Data Guard environment?

A.
a flash recovery area must be configured

B.
The database must be in MOUNT state.

C.
The database must be in ARCHIVELOG mode.

D.
A far sync instance must be configured to flash back a standby when the primary has been flashed back.

E.
The Data Guard Broker must be used.