Which two statements are true about associative arrays and varrays?

Which two statements are true about associative arrays and varrays? (Choose two.)

A.
Only varrays must start with the subscript 1.

B.
Only varrays can be used as column types in database tables.

C.
Both associative arrays and varrays must start with the subscript 1.

D.
Both associative arrays and varrays can be used as column types in database tables.