Which statement best describes the primary uses of NAT $($Network Address Translation$)?$

Which statement best describes the primary uses of NAT $($Network Address Translation$)?$

what is the answer?

$1.$To translate private IP addresses to public IP addresses for internet connectivity.

$2.$To allocate IP addresses dynamically to network devices.

$3.$To encrypt network traffic for enhanced security.

$4.$To convert domain names to IP addresses.