Question: In WLAN PLMN Selection procedures, what is a prerequisite for the Mobile Equipment (ME) to read selectors for WLAN PLMN selection, and where does it read these selectors from?
Option 1: Service n°59 "available", reads from EFADN
Option 2: Service n°60 or nº61 "available", reads from EFUPLMNWLAN and/or EFOPLMNWLAN
Option 3: Service n°62 "available", reads from EFPHASE
Option 4: Service n°58 "available", reads from EFLOCI
Explanation: For WLAN PLMN Selection procedures to initiate, the prerequisite is that either service n°60 or nº61 must be "available". The ME then proceeds to read the necessary selectors for this process from two specific Elementary Files (EFs): the User controlled PLMN selector from EFUPLMNWLAN and/or the Operator controlled PLMN selector from EFOPLMNWLAN. This ensures that the correct PLMN is selected for WLAN access, aligning with telecom standards for network selection and authentication procedures.