Universal Containers (UC) uses a custom object called Vendor. The Vendor custom object has a Master-Detail relationship with the standard Account object. Based on some internal discussions, the UC administrator tried to change the Master-Detail relationship to a Lookup relationship but was not able to do so. What is a possible reason that this change was not permitted?

A. The Vendor records have existing values in the Account object.
B. The Account object is included on a workflow on the Vendor object.
C. The Account records contain Vendor roll-up summary fields.
D. The Vendor object must use a Master-Detail field for reporting.

Suggest answer: C

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