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Who developed one of the first mathematical models of a multilevel-security computer system?
Correct Answer: C
Explanation/Reference: In 1973 Bell and LaPadula created the first mathematical model of a multi-level security system. The following answers are incorrect: Diffie and Hellman. This is incorrect because Diffie and Hellman was involved with cryptography. Clark and Wilson. This is incorrect because Bell and LaPadula was the first model. The Clark-Wilson model came later, 1987. Gasser and Lipner. This is incorrect, it is a distractor. Bell and LaPadula was the first model.