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多項選擇題

You work as a network technician at. Your boss, Mrs. , is interested in the Spanning Tree Protocol timers. 
What can you tell her regarding the default STP timers? ()

A.The hello time is 5 seconds.
B.The forward delay is 10 seconds.
C.The hello time is 2 seconds.
D.The forward delay is 15 seconds
E.The max_age timer is 15 seconds.
F.The hello time is 10 seconds.
G.The max_age timer is 20 seconds.
H.The forward delay is 20 seconds.
I.The max_age timer is 30 seconds.

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