Which vital role does the U.S. Computer Security Incident Response Team (CSIRT) provide?

A.
Incident response services to any user, company, government agency, or organization in partnership with
the Department of Homeland Security

B.
Maintenance of the nation’s Internet infrastructure, builds out new Internet infrastructure, and
decommissions old Internet infrastructure

C.
Registration of critical penetration testing for the Department of Homeland Security and public and private
sectors

D.
Measurement of key vulnerability assessments on behalf of the Department of Defense (DOD) and State
Department, as well as private sectors