In what situation would a network administrator most likely implement root guard?

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In what situation would a network administrator most likely implement root guard?

on all switch ports that connect to a Layer 3 device
on all switch ports that connect to another switch
on all switch ports that connect to host devices
on all switch ports (used or unused)
on all switch ports that connect to another switch that is not the root bridge

Explanation: Root guard in conjunction with PortFast, and BPDU guard is used to prevent an STP manipulation attack.