What does the blinking yellow Activity/PoE LED indicate on an N-Series switch?

What does the blinking yellow Activity/PoE LED indicate on an N-Series switch?
A . There is no current transmit/receive activity and PoE power is off.
B . There is no current transmit/receive activity and PoE power is on.
C . There is current transmitting/receiving and PoE power is on.
D . There is current transmitting/receiving and PoE power is off.

Answer: C