The * (star) property of the Biba model states that:
A.
Subjects cannot read from a higher level of integrity relative to their
level of integrity.
B.
Subjects cannot write to a higher level of integrity relative to their
level of integrity.
C.
Subjects cannot read from a lower level of integrity relative to their
level of integrity.
D.
Subjects cannot write to a lower level of integrity relative to their level
of integrity.