What is the purpose of port security in Cisco switches?

What is the purpose of port security in Cisco switches?

what is the answer?

$1.$To encrypt all data traffic passing through switch ports to ensure secure communication.

$2.$To restrict access to specific IP addresses and limit the bandwidth on switch ports.

$3.$To prevent unauthorized devices from connecting to switch ports and ensure that only authorized devices can access the network.

$4.$To disable switch ports immediately after a violation attempt and send an SNMP trap to the network administrator.