Question: In which scenario is the 5GMM-REGISTERED.PLMN-SEARCH substate chosen in the User Equipment (UE)?
Option 1: When the UE is connected to a 3GPP access network and has completed the registration process.
Option 2: While the UE is searching for Public Land Mobile Networks (PLMNs) or Single Network Slice Provisioning (SNPNs).
Option 3: When the UE is in idle mode and not actively communicating with the network.
Option 4: During handover from a non-3GPP access to a 3GPP access network.
Explanation: The correct answer is Option 2 because, according to the specification, the 5GMM-REGISTERED.PLMN-SEARCH substate is chosen in the UE while it is searching for PLMNs or SNPNs. This indicates that this substate is related to the process of searching and selecting a network by the UE.