Question: In which scenario will a UE choose the substate 5GMM-DEREGISTERED.LIMITED-SERVICE?
Option 1: When the selected cell is in a normal service state and the UE has a valid subscription.
Option 2: When the UE is roaming and the selected cell belongs to a visited PLMN that has a roaming agreement with the UE's home PLMN.
Option 3: When the selected cell for 3GPP access or TA for non-3GPP access is unable to provide normal service due to being in a forbidden PLMN, SNPN, tracking area, or CAG restrictions.
Option 4: When the UE has an active PDU session and receives a new PDU session request from the network.
Explanation: The correct answer is Option 3 because the substate 5GMM-DEREGISTERED.LIMITED-SERVICE is chosen when the selected cell for 3GPP access or TA for non-3GPP access is unable to provide normal service due to being in a forbidden PLMN, SNPN, tracking area, or CAG restrictions. This scenario indicates that the UE cannot obtain normal service from the selected cell and therefore enters the limited-service state.