Which two statements are true regarding single row functions?

Which two statements are true regarding single row functions? (Choose two.)

A.
They can be nested only to two levels

B.
They always return a single result row for every row of a queried table

C.
Arguments can only be column values or constant

D.
They can return a data type value different from the one that is referenced

E.
They accept only a single argument

Explanation: