What are the relevant use cases for helper key figures? Note: There are 2 correct answers to this questions.

What are the relevant use cases for helper key figures? Note: There are 2 correct answers to this questions.
A . Used at any level of calculation level except the Request Level
B . Used when you have more than three inputs at different planning levels in one calculation
C . Used by end-users in planning views to help visualize cross-period calculations
D . Used to break down a large calculation into manageable subcalculations

Answer: B D