A.The size of the redo buffer in SGA. 
B.The instance that will perform recovery in Real Application Cluster database. 
C.The number of blocks to be read during instance recovery, or the time needed to complete instance recovery. 
D.The number of passes through the redo logs made by the recovery process to identify blocks needing recovery.

A.ALTER TABLE employees monitor index employee_idx_fk; 
B.ALTER INDEX employee_idx_fk monitoring on; 
C.ALTER TABLE employees monitor all indexes; 
D.ALTER INDEX employee_idx_fk monitoring usage;