Which two statements about the spanning-tree timers in a switched network are true? (Choose two)
A. After receiving a BPDU from the root bridge, a non-root bridge waits for the hello interval before forwarding it out.
B. The root bridge sends out a TCN every max-age interval.
C. The root bridge sends out a configuration BPDU every hello interval.
D. The default hello time is two seconds.
