Which security model is based on the military classification of data and people with clearances?

Which security model is based on the military classification of data and people with clearances?
A .  Brewer-Nash model
B .  Clark-Wilson model
C .  Bell-LaPadula model
D .  Biba model

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Answer: C

Explanation: The Bell-LaPadula model is a confidentiality model for information security based on the military classification of data, on people with clearances and data with a classification or sensitivity model. The Biba, Clark-Wilson and Brewer-Nash models are concerned with integrity. Source: HARE, Chris, Security Architecture and Models, Area 6 CISSP Open Study Guide, January 2002.