How does 3DES use the DES algorithm to encrypt a message?

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answerhappygod
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How does 3DES use the DES algorithm to encrypt a message?

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How does 3DES use the DES algorithm to encrypt a message?

A. encrypts a message with K1, decrypts the output with K2, then encrypts it with K3
B. encrypts a message with K1, encrypts the output with K2, then encrypts it with K3
C. encrypts K1 using K2, then encrypts it using K3, then encrypts a message using the output key
D. encrypts a message with K1, encrypts the output with the K2, then decrypts it with K3
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