What is ultimate purpose of the Trusted Computing Base (TCB)?

A.
Defines the level of security a system provides

B.
Defines the level of security assurance a system provides

C.
Defines levels of security classifications a system provides

D.
Defines security access classifications a system provides

Explanation:
The Trusted Computing Base (TCB) defines the level of assurance for the
trust a system provides. It does not define the level of security it provides, which
is more related to perception. Trust, instead, is a quantifiable measure based on
the level of compliance with security requirements known to be effective in
protecting systems.