Salesforce Platform Developer I (legacy) — Question 57

What is an example of a polymorphic lookup field in Salesforce?

Answer options

• A. The WhatId field on the standard Event object
• B. The ParentId field on the standard Account object
• C. A custom field, Link__c, on the standard Contact object that looks up to an Account or a Campaign
• D. The LeadId and ContactId fields on the standard Campaign Member object

Correct answer: A

Explanation

The WhatId field on the standard Event object is a polymorphic lookup field because it can reference either an Account or a Campaign. In contrast, the ParentId field on the Account object is a standard lookup that only points to one specific object, and the other options either refer to fields that do not exhibit polymorphism or are not lookup fields.