What determines the strength of a secret key within a symmetric key cryptosystem?

What determines the strength of a secret key within a symmetric key cryptosystem?
A. A combination of key length, degree of permutation, and the complexity of the data-encryption algorithm that uses the key
B. A combination of key length, initial input vectors, and the complexity of the data-encryption algorithm that uses the key
C. A combination of key length and the complexity of the data-encryption algorithm that uses the key
D. Initial input vectors and the complexity of the data-encryption algorithm that uses the key

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