Why would the switch be considered as a root bridge?

Refer to the exhibit.

Why would the switch be considered as a root bridge?
A . The bridge priority is 1 and all ports are forwarding.
B . The switch priority for VLAN 1 and the macro specifies "This Bridge is the root".
C . The bridge priority is 128.19 and all ports are forwarding.
D . The switch priority value is zero, it has the lowest priority value for VLAN 1.

View Answer

Answer: D

Explanation:

For priority, the range is 0 to 61440 in increments of 4096; the default is 32768. The lower the number, the more likely the switch will be chosen as the root switch.

Reference: http://www.cisco.com/en/US/docs/switches/lan/catalyst2950/software/release/12.1_9_ea1/config uration/ guide/swstp.html#wp1020666