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Salesforce Certified Platform Developer I (PDI) · Salesforce
Select one answer.
Written by other learners. Comments can disagree with the marked answer — check the official documentation when in doubt.
Remember Account-Opportunity is one of the exceptions in lookup relationship which can have a roll-up summary.(roll-up summery supposed to be only for master-detail relationship). Other exceptions are 'Opportunity-Opportunity Product' and 'Campaign-Campaign Member'... Anyway C is the correct answer.
c is right