Salesforce Training Question
Where can custom roll-up summary fields be created using a Standard Object relationship?
A. On Account using Opportunity records
B. On Account using Case records
C. On Opportunity using Opportunity Product records
D. On Campaigns using Campaign Member records.
E. On Quote using Order Records
Discussion: You have to see where the Standard Entity already has a relationship. Of course in Salesforce, Account and Opportunity already have a relationship - so does Opportunity and Opportunity Product records. So that should get you what you are looking for. Good luck on your Salesforce Platform Developer II studying.