Which statement is true about TCN propagation in RSTP (802.1w)?

Which statement is true about TCN propagation in RSTP (802.1w)?

A.
The originator of the TCN immediately floods this information through the network.

B.
The TCN propagation is a two step process.

C.
A TCN is generated and sent to the root bridge.

D.
The root bridge must flood this information throughout the network.

Explanation:
The TCN propagation in RSTP is unique in the way that the originator of the TCN floods
information through the network.