Which approach should a developer take to automatically add a “Maintenance Plan” to each Opportunity that includes an “Annual Subscription” when an opportunity is closed?

Which approach should a developer take to automatically add a “Maintenance Plan” to each Opportunity that includes an “Annual Subscription” when an opportunity is closed?
A . Build a OpportunityLineItem trigger that adds a PriceBookEntry record.
B . Build an OpportunityLineItem trigger to add an OpportunityLineItem record.
C . Build an Opportunity trigger that adds a PriceBookEntry record.
D . Build an Opportunity trigger that adds an OpportunityLineItem record.

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Answer: D