Question: What is the primary purpose of the 'Steering of Roaming (SoR) during the registration procedure' service in a 5G system from the home operator's perspective?
Option 1: To manage network congestion by distributing User Equipment (UE) across different networks post-registration.
Option 2: To influence the User Equipment's (UE) initial choice of network for registration based on roaming agreements.
Option 3: To enhance security during the registration process by verifying UE authenticity on a preferred network.
Option 4: To redirect a user to a specific (possibly preferred) network when they attempt to register with a non-preferred network.
Explanation: The correct answer, Option 4, aligns with the described functionality of SoR during registration, which enables the home operator to steer a user away from a non-preferred network they are trying to register with, towards a more desirable one. This is distinct from influencing the initial network choice (Option 2), managing post-registration congestion (Option 1), or enhancing security (Option 3), which are not the primary purposes of SoR in this context.