A.Every switch in the network receives the broadcast and will forward it out all ports.
B.Every switch in the network receives the broadcast，but only Switch 4 will forward it out port 2.
C.Switches 1，2，and 4 will receive the broadcast，but only Switch 4 will forward it out port 2.
D.Only Switch 4 will receive the broadcast and will forward it out port 2.

A.30 seconds
B.5 minutes
C.1 minute
D.10 seconds
E.5 seconds
F.None of the other alternatives apply