How do you turn on Self-Tuning Memory Manager (STMM)?

How do you turn on Self-Tuning Memory Manager (STMM)?

A.
UPDATE DB CFG FOR <database> USING SELF_TUNING_MEM ON

B.
db2set SELF_TUNING_MEM=ON

C.
UPDATE DB CFG FOR <database> USING AUTOMATIC_MEMORY ON

D.
db2set AUTOMATIC MEMORY=ON