Which two statements are true about STP root guard? (Choose two.)

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Which two statements are true about STP root guard? (Choose two.)

Root guard is enabled on a per-port basis.
If a root guard enabled port receives a inferior BPDU from a nonroot switch, the port transitions to the blocking state to prevent a root bridge election.
Root guard requires that PortFast be enabled on a switch port.
Root guard re-enables a switch port once it stops receiving superior BPDUs.
Root guard should be configured on all ports on the desired root bridge to prevent another bridge from becoming the root.