Question: In an MBMS context, what is the primary purpose of including a `groupID` element within a `groupFilter` as part of the Filter Description metadata fragment?
Option 1: To specify the geographical location for content delivery.
Option 2: To define the technical capabilities required by the User Equipment (UE).
Option 3: To enable MBMS clients to selectively receive content based on user profile matching (e.g., social group, age, gender).
Option 4: To set the priority level for competing multimedia streams.
Explanation: The inclusion of `groupID` elements within a `groupFilter` allows for content to be targeted at specific groups (e.g., based on social, demographic, or interest criteria). This enables MBMS clients to filter and receive only the content that matches the user's profile, enhancing the personalization and efficiency of the multimedia broadcast/multicast service.