What is necessary in order to enable optimization hints?

What is necessary in order to enable optimization hints?
A .  ASYSIB
B . PLAN_TABLEtable.
C .  INSERT authority on SYSIB
D . SYSQUERY table.
E .  A required index on the PLAN_TABLE used for optimization hints.
F .  ADSN USERQUERY TABLE table under the schema in which hints will be created.

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Answer: C