Why would you use parameter mapping in a calculation view? Note: There are 2 correct answers to this question.

Why would you use parameter mapping in a calculation view? Note: There are 2 correct answers to this question.
A . To pass variable values to external value help views
B . To assign variables to one or more attributes
C . To push down filters to the lowest level calculation views
D . To convert the data types of input parameters

Answer: A,C