Question: What is the primary purpose of including the IMEISV (International Mobile Equipment Identity and Software Version) information element in signaling flows during a UE's attach to an access network?
Option 1: To authenticate the user's subscription profile
Option 2: To authorize QoS (Quality of Service) parameters for the UE
Option 3: To identify the specific UE employed by the user requesting attachment to the network
Option 4: To initiate a software update for the UE's operating system
Explanation: The IMEISV is used to uniquely identify the User Equipment (UE) on a cellular network. During the attach process, including the IMEISV allows the network to recognize and manage the specific device attempting to connect, which is crucial for subsequent operations such as authentication, service provisioning, and billing.