Which attribute must be configured within the spanning-tree protocol to ensure the new switch is the root bridge?

A new switch is added to an existing network with three switches already in place.
Which attribute must be configured within the spanning-tree protocol to ensure the new switch is the root bridge?

A.
root-id

B.
port-id

C.
bridge priority

D.
system MAC address

Explanation:
Configuring the Bridge Priority

Use the bridge priority to control which bridge is elected as the root bridge.
Also use the bridge priority to control which bridge is elected the root bridge when the initial root bridge fails.

The root bridge for each STP instance is determined by the bridge ID. The bridge ID consists of a configurable bridge priority and the MAC address of the bridge. The bridge with the lowest bridge ID is elected as the root bridge. If the bridge priorities are equal or if the bridge priority is not configured, the bridge with the lowest MAC address is elected the root bridge.

The bridge priority can also be used to determine which bridge becomes the designated bridge for a LAN segment.
If two bridges have the same path cost to the root bridge, the bridge with the lowest bridge ID becomes the designated bridge.

The bridge priority can be set only in increments of 4096.

To configure the bridge priority, include the following statement:
bridge-priority priority;

You can configure this statement at the following hierarchy levels:

* [edit protocols (mstp | rstp)]
* [edit protocols mstp msti msti-id]
* [edit protocols vstp vlan vlan-id]
* [edit routing-instances routing-instance-name protocols (mstp | rstp)]
* [edit routing-instances routing-instance-name protocols mstp msti msti-id]
* [edit routing-instances routing-instance-name protocols vstp vlan vlan-id]