Which statement describes the term root bridge in the operation of STP?
- It is a switch that is at the top of the spanning tree and whose ports are all forwarding and are all categorized as designated ports.
- It is a value that decides which switch can become the root bridge.
- It is a feature that prevents any alternative or root ports from becoming designated ports because of a loss of BPDUs on the root port.
- It is a safety mechanism that shuts down ports configured with STP portfast upon receipt of a BPDU.
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