A customer wants to restrict access to a subnet in their network to a discreet number of employers. The customer tried to restrict it through firewalls, but this solution only handles the IP addresses.
Which solution will allow them to restrict access to z/OS users?
A. IP defensive filtering in z/OS Communications Server
B. Network Address Port Translation (NAPT) in z/OS Communications Server
C. Certificate management in z/OS
D. SERVAUTH class in RACF