Which set of statements about Spanning Tree Protocol default timers is true?

Which set of statements about Spanning Tree Protocol default timers is true?

A.
The hello time is 2 seconds.
The forward delay is 10 seconds.
The max_age timer is 15 seconds.

B.
The hello time is 2 seconds.
The forward delay is 15 seconds.
The max_age timer is 20 seconds.

C.
The hello time is 2 seconds.
The forward delay is 20 seconds.
The max_age timer is 30 seconds.

D.
The hello time is 5 seconds.
The forward delay is 10 seconds.
The max_age timer is 15 seconds.

E.
The hello time is 5 seconds.
The forward delay is 15 seconds.
The max_age timer is 20 seconds.

Explanation: