What is a key difference between a Master-Detail Relationship and a Lookup Relationship?

What is a key difference between a Master-Detail Relationship and a Lookup Relationship?
A . A Master-Detail Relationship detail record inherits the sharing and security of its master record.
B . When a record of a master object in a Lookup Relationship is deleted, the detail records are also deleted.
C . A Lookup Relationship is a required field on an object.
D . When a record of a master object in a Master-Detail Relationship is deleted, the detail records are kept and not deleted.

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Answer: A