What do you need to be aware of when using multiple pairs of key figures in one copy operator?

What do you need to be aware of when using multiple pairs of key figures in one copy operator?

Note: There are 2 correct answers to this question.
A . Copying multiple key figures can be processed sequentially
B . Copying multiple key figures on different planning levels is not possible.
C . Necessary source key figures values are disaggregated.
D . Necessary target key figures value are disaggregated

Answer: A, D