What is the known plaintext attack used against DES which gives the result that encrypting plaintext with one DES key followed by encrypting it with a second DES key is no more secure than using a single key?

What is the known plaintext attack used against DES which gives the result that encrypting plaintext with one DES key followed by encrypting it with a second DES key is no more secure than using a single key?
A . Man-in-the-middle attack
B . Meet-in-the-middle attack
C . Replay attack
D . Traffic analysis attack

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Answer: B