What is the effect of entering the switchport port-security.. switch?

What is the effect of entering the switchport port-security configuration command on a switch?

It enables port security globally on the switch.
It dynamically learns the L2 address and copies it to the running configuration.
It restricts the number of discovery messages, per second, to be received on the interface.
It enables port security on an interface.

Explanation & Hint:

Entering the switchport port-security command on a switch interface has the effect of enabling port security on that specific interface. Port security is a feature that allows you to restrict input to an interface by limiting and identifying MAC addresses of the workstations that are allowed to access the port. When you enable port security on an interface, the switch will start enforcing the restrictions that have been configured for that port such as limiting the number of MAC addresses or specifying exactly which MAC addresses can connect.

What is the effect of entering the switchport port-security configuration command on a switch?

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