What would Receiving an Alarm Indication Signal of Blue indicate on your T1 connection where your voice traffic is going over?

A.
Blue means there is an alarm occurring in the building, it is part of your disaster plan.

B.
Blue means there is an alarm occurring on the line downstream from the equipment that is connected to the port

C.
There is no blue alarm, only red and yellow.

D.
Blue means there is an alarm occurring on the line upstream from the equipment that is connected to the port