Exam DEX-403 Topic 3 Question 122 Discussion

A. A roll-up summary field will need to be created on the Galaxy__c object with a field filter that select all related Star_c records

B. The lookup relationship will need to be converted to a master-detail relationship before a roll-up summary field can be created.

C. The roll-up summary can be achieved by creating a formula field on the Galaxy__c object.

D. The roll-up summary can be achieved by creating a formula field on the Star__c object.