which value to implement automatic PGA memory management?

Which parameter must be set to which value to implement automatic PGA memory
management?

A.
Set pga_aggregate_target and sga_target to the same value.

B.
Set memory_target to zero.

C.
Set sgajtarget to zero.

D.
Set STATISTICS_LEVEL to BASIC.

E.
Set pga_aggregate_target to a nonzero value.