A requirement states

A requirement states: When a customer applies for a credit card, a credit check must be
completed in order for the credit card to be approved.
Select the case type relationship that satisfies the requirement.
A. Make credit card request a child case of credit check.
B. Make credit check a spin-off case of credit card request.
C. Make credit check a child case of credit card request.
D. Make both loan request and credit check top cases.
Answer: B

Do you know the explanation of the answer??