What type of relationship should an administrator use to ensure that expense line items can be aggregated?

Universal Containers wants to track expense reports and expense line items. Values from expense line item records need to be aggregated and displayed on the expense record.

What type of relationship should an administrator use to ensure that expense line items can be aggregated?
A . Roll-up summary
B . Lookup
C . Hierarchical
D . Master-detail

Answer: D