Question: For a User Equipment (UE) to utilize ProSe direct discovery announcing for public safety, what condition must be met regarding authorization, as related to the EFPROSE_ANN file in the USIM application?
Option 1: The UE must have an active subscription to a PLMN listed in the EFPROSE_ANN file.
Option 2: The ME (Mobile Equipment) must either be authorized as per the content of EFAD or have received service authorization from the ProSe Function, but not necessarily both.
Option 3: The UE's ME must only be authorized through the ProSe Function for public safety services; EFAD content is irrelevant in this context.
Option 4: No specific authorization is required for public safety services if the EFPROSE_ANN file is present and contains at least one PLMN record.
Explanation: This option correctly reflects the requirement that for a UE to use ProSe direct discovery announcing, as per the information stored in the EFPROSE_ANN file, the Mobile Equipment (ME) needs to meet one of two authorization conditions: either be authorized according to the content of EFAD or have received service authorization directly from the ProSe Function. This ensures that only properly authorized devices can engage in public safety-related direct discovery announcing.