The National Computer Security Center (NCSC) is:

A.
An activity within the US Department of Commerce that provides
information security awareness training and develops standards for
protecting sensitive but unclassified information

B.
A joint enterprise between the NSA and NIST for developing
cryptographic algorithms and standards

C.
A division of the National Institute of Standards and Technology
(NIST) that issues standards for cryptographic functions and
publishes them as Federal Information Processing Standards (FIPS)

D.
A branch of the National Security Agency (NSA) that initiates
research and develops and publishes standards and criteria for
trusted information systems

Explanation:
The NCSC promotes information systems security awareness and

technology transfer through many channels, including the annual
National Information Systems Security Conference. It was founded
in 1981 as the Department of Defense Computer Security Center , and
its name was change in 1985 to NCSc. It developed the Trusted Computer
Evaluation Program Rainbow series for evaluating commercial
products against information system security criteria. All the other
answers are, therefore incorrect since they refer to NIST, which is
under the US Department of Commerce.