The Biba model axiom An object at one level of integrity is not permitted
to modify (write to) an object of a higher level of integrity (no write up)
is called:

A.
The Constrained Integrity Axiom

B.
The Discretionary Integrity Axiom

C.
The Simple Integrity Axiom

D.
The * (star) Integrity Axiom

Explanation:
The correct answer is “The * (star) Integrity Axiom”.
Answers a and d are distracters. Answer the Simple Integrity Axiom states, Asubject at one level
of integrity is not permitted to observe (read) an object of lower integrity (no read down).