How should an administrator define an application object to meet these requirements?

Universal Containers wants to use Salesforce as part of their recruiting process. They need to track applicants and positions. Applicants should be able to apply for multiple positions. There should be a field on both the position and applicant records that sums the number of applications for each candidate.

How should an administrator define an application object to meet these requirements?
A . Create master-detail fields on the application object to both the position and applicant.
B . Create lookup fields on the application object to both the position and applicant.
C . Create a lookup field on both the position and applicant to the application.
D . Create a master-detail field on both the position and applicant to the application.

Answer: D