Question: What is the primary purpose of access control mechanisms applied to every intra-PLMN backbone network in a GPRS packet domain?
Option 1: To ensure Quality of Service (QoS) for high-priority data transmissions
Option 2: To achieve a required level of security for GPRS packet domain data and signalling
Option 3: To facilitate seamless handovers between different PLMNs
Option 4: To optimize network resource allocation among various IP services
Explanation: Applying access control mechanisms to intra-PLMN backbone networks in the GPRS packet domain is crucial for maintaining security. This protects sensitive information and prevents unauthorized access, vital for telecommunications service integrity.