Aggregator transformation

What type of expressions can be used in an Aggregator transformation output port?

Choose Answer

(A)
Aggregate or non-aggregate expressions, provided they are not used together in a single output port.
(B)
Aggregate and non-aggregate expressions, together in the same output port.
(C)
Aggregate, non-aggregate and conditional expressions, together in the same output port.
(D)
Aggregate only.