In an ODI interface, if a business rule is declared to calculate a sum aggregation, does a knowledge module need to be customized in order to create the correct code?

In an ODI interface, if a business rule is declared to calculate a sum aggregation, does a
knowledge module need to be customized in order to create the correct code?

A.
Yes, business rules and the physical implementation are strictly interlayed in ODI.

B.
Yes, a customization is needed only for aggregation functions.

C.
No, aggregation code is generated automatically by ODI according to the mapping logic rules.

D.
No, it is not needed but, a variable must be declared in the source mapping in order to
generatethe correct sum.

Explanation: