Question: Assume a secret key cryptography algorithm with its key length 1 2 8 bits. If we do encryption by using this algorithm twice with two

Assume a secret key cryptography algorithm with its key length 128 bits. If we do encryption by using this algorithm twice with two different keys, what is the equivalent key length of this operation?
256 bits
128 bits
129 bits
64 bits
Assume a secret key cryptography algorithm with its key length 128

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