What is the primary purpose of the initial device configuration process on Cisco IOS devices?

what number is the answer here?

$1.)$What is the primary purpose of the initial device configuration process on Cisco IOS devices?

$2.$To optimize the device's performance for high$-$speed data transfers.

$3.$ To customize the device's appearance and user interface.

$4.$To establish network connectivity and basic settings for the device.

T$5.$o enable advanced networking features and protocols.