A requirement states When a customer applies for a credit card, a credit check must...

For the requirement that a credit check must be completed for a credit card to be approved, incorporating the credit check as part of the credit card application process is necessary. The most straightforward way to model this is by using case type relationships.

C. Make credit check a child case of credit card request: This configuration establishes the credit check as an integral step within the credit card request process, ensuring that the credit check is completed before the credit card can be approved. Making the credit check a child case means it is directly associated with and dependent on the parent credit card request case, aligning perfectly with the requirement.

Making both the loan request and credit check top cases (A) does not establish the necessary dependency. Creating a spin-off case (B) suggests a parallel or subsequent process not inherently dependent on the completion of the credit check for the credit card request, which could misalign with the requirement. Making the credit card request a child case of credit check (D) inverts the intended relationship and does not accurately represent the process flow described in the requirement.