Referring to the exhibit, which configuration change should be performed?

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You are responsible for managing a Layer 2 network using RSTP for loop prevention. You recently committed the configurations shown in the exhibit. Unfortunately, Switch-2 became the root bridge and you must ensure that Switch-1 becomes the root bridge, when available, for this RSTP topology.

Referring to the exhibit, which configuration change should be performed?
A . Configure the ge-0/0/1 and ge-0/0/8 interfaces on Switch-1 to have a priority of 255.
B. Configure the system MAC on Switch-1 to be higher than the other two switches.
C. Configure the bridge-priority on Switch-1 as 4k.
D. Configure the ge-0/0/1 and ge-0/0/8 interfaces on Switch-1 to have a cost of 0.

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Answer: D