What does the simple integrity axiom mean in the Biba model?

What does the simple integrity axiom mean in the Biba model?
A .  No write down
B .  No read down
C .  No read up
D .  No write up

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Answer: B

Explanation: The simple integrity axiom of the Biba access control model states that a subject at one level of integrity is not permitted to observe an object of a lower integrity (no read down). Source: KRUTZ, Ronald L. & VINES, Russel D., The CISSP Prep Guide: Mastering the Ten Domains of Computer Security, John Wiley & Sons, 2001, Chapter 5: Security Architectures and Models (page 205).