Question: What is a prerequisite for initiating the personalization process on a Mobile Equipment (ME), in relation to the SIM/USIM personalization indicator?
Option 1: The SIM/USIM personalization indicator must be previously set to 'on' to allow for updates.
Option 2: The ME must have a pre-existing Personalisation Code Key (PCK) stored.
Option 3: The process can be initiated regardless of the SIM/USIM personalization indicator's state.
Option 4: The SIM/USIM personalization indicator must be set to 'off' on an currently unpersonalised ME.
Explanation: This is correct because, according to the specifications, the personalization process can only commence if the ME is in an unpersonalized state, indicated by the SIM/USIM personalization indicator being set to 'off'. This ensures that unauthorized or accidental personalization does not occur.