What is a true statement regarding Master-Detail relationships?

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Question:
 What is a true statement regarding Master-Detail relationships?

1.Deleting a master record in a Master-Detail relationship deletes all related detail records

2.Master-Detail relationships can convert to a lookup relationships if no roll-up summary field exists on the master object

3.A Master-Detail relationship cannot be created if the custom object on the detail side already contains data

4.All Of above


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