Question: In a GSM/UMTS network, when a Visitor Location Register (VLR) initiates the 'Obtain Authentication Sets' process, what is its primary objective regarding the subscriber's data?
Option 1: To fetch authentication vectors from the subscriber's Home Location Register (HLR) for security verification.
Option 2: To update the subscriber's profile information in the HLR with new service settings.
Option 3: To notify the HLR of a change in the subscriber's current location area.
Option 4: To request billing information from the HLR for the subscriber's recent activity.
Explanation: The primary objective of the VLR initiating the 'Obtain Authentication Sets' process is to retrieve authentication vectors (e.g., RAND, XRES, CK, IK, AUTN) from the subscriber's HLR. These vectors are crucial for authenticating the subscriber and ensuring secure access to network services.