Question: In the context of the SGs interface, who includes the VLR name information element when sending a message?
Option 1: Both MME and VLR always include the VLR name information element regardless of who is sending.
Option 2: Only the VLR includes the VLR name information element when it is the sending entity.
Option 3: The MME always includes the VLR name information element, even if the VLR initiated the message.
Option 4: Neither the MME nor the VLR includes the VLR name information element in any sent messages.
Explanation: This is correct because when the VLR sends a message over the SGs interface, it must identify itself by including its VLR name. Conversely, if the MME is sending, it does not include this information element, ensuring proper identification and routing of messages between the Mobility Management Entity (MME) and the Visitor Location Register (VLR).