What is the name of the first mathematical model of a multi-level security policy used to define the concept of a secure state, the modes of access, and rules for granting access?

What is the name of the first mathematical model of a multi-level security policy used to define the concept of a secure state, the modes of access, and rules for granting access?
A .  Clark and Wilson Model
B .  Harrison-Ruzzo-Ullman Model
C .  Rivest and Shamir Model
D .  Bell-LaPadula Model

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Answer: D

Explanation: Source: TIPTON, Hal, (ISC)2, Introduction to the CISSP Exam presentation.