Question: What is the primary purpose of the 'Group ID for Network Selection' (GIN) in the context of a 5G System (5GS), and how does its structure support this purpose?
Option 1: To identify individual User Equipment (UE) for billing purposes, consisting of only a Mobile Country Code (MCC) and Mobile Network Code (MNC).
Option 2: To authenticate and authorize access to a Single Network Public Namespace (SNPN), enhancing the likelihood of selecting a preferred SNPN, with a structure comprising MCC, MNC, and a Network ID (NID) that includes an assignment mode indicator.
Option 3: To secure data transmission between Credential Holders, using a unique identifier that changes with each session, composed of a dynamic NID and a static PLMN ID.
Option 4: To manage Quality of Service (QoS) for different applications, utilizing a GIN that solely consists of a 44-bit NID without MCC or MNC.
Explanation: The correct answer accurately reflects the primary purpose of the GIN - to facilitate authentication and authorization for accessing an SNPN, enhancing preferred network selection. The GIN's structure (MCC, MNC, and NID with assignment mode) supports this by providing a standardized identifier for efficient network access based on predefined criteria.