A difference between the Information Technology Security Evaluation
Criteria (ITSEC) and the Trusted Computer System Evaluation Criteria
(TCSEC) is:

A.
TCSEC addresses availability as well as confidentiality

B.
ITSEC addresses confidentiality only

C.
ITSEC addresses integrity and availability as well as confidentiality

D.
TCSEC separates functionality and assurance

Explanation:
TCSEC addresses confidentiality only and bundles functionality
and assurance. Thus, the other answers are incorrect. By separating
functionality and assurance as in ITSEC, one could specify fewer security
functions that have a high level of assurance. This separation carried
over into the Common Criteria.