Refer to the exhibit. 
Which two statements are true about the displayed STP state? (Choose two.)
A.
The STP version configured on the switch is IEEE 802.1w.
B.
Port-channel 1 is flapping and the last flap occurred 1 minute and 17 seconds ago.
C.
The switch does not have PortFast configured on Gi0/15.
D.
BPDUs with the TCN bit set are transmitted over port channel 1.