Which of the Following Is a Primary Service of the U.S

Which of the following is a primary service of the U.S. Computer Security Incident Response Team (CSIRT) ?

A) CSIRT provides an incident response service to enable a reliable and trusted single point of contact for reporting computer security incidents worldwide.
B) CSIRT provides a computer security surveillance service to supply a government with important intelligence information on individuals travelling abroad.
C) CSIRT provides a penetration testing service to support exception reporting on incidents worldwide by individuals and multi-national corporations.
D) CSIRT provides a vulnerability assessment service to assist law enforcement agencies with profiling an individual's property or company's asset.