What is the meaning of the inverted orange triangle (marked "0") in the Alarm Summary tab of Cisco WCS?

Refer to the exhibit.

What is the meaning of the inverted orange triangle (marked “0”) in the Alarm Summary tab of
Cisco WCS?

A.
number of major alarms

B.
number of minor alarms

C.
number of critical alarms

D.
number of system alarms