What is the purpose of port security in Cisco switches?

what the number is the answer here?

T$1.$ o disable switch ports immediately after a violation attempt and send an SNMP trap to the network administrator.

$2.$ To prevent unauthorized devices from connecting to switch ports and ensure that only authorized devices can access the network.

$3.$ to encrypt all data traffic passing through switch ports to ensure secure communication.

$4.$ To restrict access to specific IP addresses and limit the bandwidth on switch ports.