What does this indicate?

Refer to the exhibit.

An administrator notices that the Rack View of Avaya Orchestrator is highlighted with a Red X on the graphical representation of the rack.

What does this indicate?
A . At least 50% of the hosts in the rack contain a service which is in critical state.
B . The rack has a front door that is currently unlocked.
C . The rack is currently unreachable.
D . At least one of the hosts in the rack contains a service which is in critical state.

Answer: D

Explanation:

Reference: https://downloads.avaya.com/css/P8/documents/101061680 (16)