In $4$G LTE cellular systems, what is an International Mobile Subscriber Identity $($IMSI$)?$

Group of answer choices

Assigned by a mobile carrier network to a device, when the device attaches to the radio access network, serving a similar link$-$layer role as MAC addresses in a wired network.

A $64-$bit identifier that identifies the cellular network to which an mobile subscriber is attaching. Somewhat analogous to the Autonomous System $($AS$)$ number used in BGP to identify$/$name networks.

A $64-$bit identifier stored on a cellular SIM $($Subscriber Identity Module$)$ card that identifies the subscriber in the worldwide cellular carrier network system.

A fancy name for a globally unique phone number, including country code.