A network is seeing a posture status "unknown" for a single corporate machine on the Cisco ISE authentication report, whereas the other machines and reported as "complaint". Which option is the reason for machine being reported as "unknown"?
A. Posture compliance condition is missing on the machine.
B. Posture agent is not installed on the machine.
C. Posture service is disabled on Cisco ISE.
D. Posture policy does not support the OS.
