A standby database is in mounted state and you are required to perform a failover to the physical standby. Which solution is best suited forthis scenario? 

Answer options:

A. ALTER DATABASE RECOVER MANAGED STANDBY DATABASE statement with the FINISH keyword
B. ALTER DATABASE PREPARE TO SWITCHOVER and ALTER DATABASE COMMIT TO SWITCHOVER statements
C. ALTER DATABASE RECOVER TO STANDBY DATABASE statement with the FINISH keyword
D. D) ALTER DATABASE PREPARE SWITCHOVER and ALTER DATABASE COMMIT TO SWITCHOVER Statements

A