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How many bytes of the secret key is generated using Diffie-Hellman encryption/decryption scheme?

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How many bytes of the secret key is generated using Diffie-Hellman encryption/decryption scheme?

(a) 256

(b) 871

(c) 1024

(d) 962

The question was asked in an interview.

I would like to ask this question from Cryptography topic in section Number Theory and Cryptography of Discrete Mathematics

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Best answer
Correct option is (a) 256

To explain I would say: Diffie-Hellman encryption/decryption scheme generates 256 bytes shared a secret key. This secret key then is used by AES key to encrypt this data.

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