Question: What is the specified string value of the Service ID for Proximity-based services (ProSe) as per 3GPP standards?
Option 1: 3GPP ProSe
Option 2: ProSe Service Category
Option 3: 3GPP Service Category
Option 4: 3GPP ProSe Service Category
Explanation: The correct answer is "3GPP ProSe Service Category" because it is the specified string value of the Service ID for Proximity-based services (ProSe) as per 3GPP standards, which ensures proper identification and categorization of ProSe services within the 3GPP framework.