The DreamHouse Realty team has a master-detail relationship set up with open house as the parent object and visitors as the child object. What type of field should the administrator add to the open…

Question

Options

• ARoll-up Summary.
• BMulti-select Picklist
• CCross-object formula field
• DIndirect lookup

• A
  15% (4)
• B
  7% (2)
• C
  74% (20)
• D
  4% (1)

Explanation

There appears to be an error in the marked correct answer. Based on Salesforce functionality, A (Roll-up Summary) is the correct answer, not C.

Why A is correct: A Roll-up Summary field is placed on the parent object in a master-detail relationship to aggregate data from child records. Since Open House is the parent and Visitors is the child, adding a Roll-up Summary field (using COUNT) to the Open House object is exactly how you'd track the number of visitor records associated with each open house.

Why the distractors are wrong:

• C (Cross-object formula field): Goes on the child object to reference fields from a parent - it can't count child records from the parent side.
• B (Multi-select Picklist): Stores a list of selected values in a single field; it doesn't aggregate related records at all.
• D (Indirect lookup): Used to relate external objects to Salesforce objects; irrelevant here.

Memory tip: Roll-up Summary = parent looks DOWN at children and counts/aggregates them. Cross-object formula = child looks UP at the parent to reference a field. The direction of "looking" tells you which object gets the field.

If your exam source marks C as correct, I'd recommend verifying against the official Salesforce Admin study guide - this appears to be a mistake in the question bank.

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