Question: In a non-removable Universal Subscriber Identity Module (nrUSIM) application behavioural test, what is the primary reason for setting the manual PLMN selection mode on the User Equipment (UE)?
Option 1: To ensure the UE connects to the network with the strongest signal
Option 2: To facilitate automatic software updates for the UICC/USIM configuration
Option 3: To restrict access to specific network services based on subscriber identity
Option 4: To guarantee the use of the defined UICC/USIM configuration for the test case
Explanation: Setting the manual PLMN selection mode ensures that the UE uses the predefined UICC/USIM configuration specified for the test case, crucial for consistent and reliable testing under controlled network conditions.