Which two statements are true about anonymous blocks and named subprograms?

Which two statements are true about anonymous blocks and named subprograms? (Choose two)

A.
Subprograms are by default executed with definer’s rights.

B.
The declare section is optional for both anonymous blocks and subprograms.

C.
Both anonymous blocks and subprograms execute by default with invoker’s rights.

D.
The declare section is mandatory for anonymous blocks and optional for subprograms.