Which two statements about the spanning-tree timers in a switched network are true?

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

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