Cloud Kicks, a global corporation, has the following environment:

– 50,000 users
– 24×7 call center operated by 25,000 users, including both employees and contractors
– A sales organization that has 15,000 users

The sales organization began processing about 120,000 updates to opportunity custom fields called priority and NextStep. They also started processing 20,000 updates to a highly nested territory hierarchy.

There was a third mass update on a Next Step field on the Action Plan custom object that has Case as a lookup field. Users started seeing a Group membership lock error in the system.

What is a probable cause for this error?

A. Due to system-initiated sharing rule recalculation, there is Lock contention

B. Due to Territory object updates, there is Lock contention on Territory object
C. Due to Action Plan custom object updates, there is Lock contention on Case records
D. Due to Opportunity object updates, there is Lock contention on Account records