Which two are true about this change?

You are required to change the Data Guard Configuration protection mode from MAXPERFORMANCE to
MAXAVAILABILITY using Enterprise Manager Cloud Control.
Which two are true about this change?

A.
If the primary database cannot write its redo to at least one synchronized standby database, then the
protection level remains unchanged.

B.
The primary database instance will remain up and running, if it cannot write redo to at least one
synchronized standby database.

C.
Transactions will not commit until all redo data needed to recover those transactions are written to the
online redo log, and to the standby redo log on at least one synchronizes standby database.

D.
Fast start failover can be enabled when making the chance.

E.
Real time apply will be automatically turned on.

Explanation:
Maximum Availability
This protection mode provides the highest level of data protection that is possible without compromising the
availability of a primary database. Transactions do not commit until all redo data needed to recover those
transactions has been written to the online redo log and to at least one synchronized standby database.
If the primary database cannot write its redo stream to at least one synchronized standby database, it operates
as if it were in maximum performance mode to preserve primary database availability until it is again able to
write its redo stream to a synchronized standby database.
https://docs.oracle.com/cd/B28359_01/server.111/b28294/protection.htm