Opportunities are in a master-detail-like relationship with Accounts (standard lookup behaves with special roll-up capabilities). Salesforce provides a standard roll-up summary feature on the Account object to count related Opportunities.
Why B (Roll-up Summary) is correct:Exact Extract:“Use a roll-up summary field to automatically display a value from related detail records on a master record. You can count related records, or calculate the sum, min, or max of a field on those records.” — Salesforce Help | Roll-Up Summary FieldsOn Account, you can create a roll-up summary field to COUNT related Opportunities.
Why B (Roll-up Summary) is correct:Exact Extract:“Use a roll-up summary field to automatically display a value from related detail records on a master record. You can count related records, or calculate the sum, min, or max of a field on those records.” — Salesforce Help | Roll-Up Summary FieldsOn Account, you can create a roll-up summary field to COUNT related Opportunities.
Why not A:Formula fields cannot count related records.
Why not C:AppExchange is not required; Salesforce provides native functionality.
Why not D:A lookup only links records—it does not perform aggregation.
[References:, Salesforce Help | Roll-Up Summary Fields, Salesforce Platform App Builder Exam Guide | Data Modeling and Management, , ]
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