Question: What is the primary purpose of APN level overload control in a PGW?
Option 1: To advertise overload information at a node level granularity.
Option 2: To apply mitigation policies to signalling traffic related to a specific APN based on advertised overload information.
Option 3: To detect overload for all APNs served by a PGW.
Option 4: To perform node overload control when internal and external resources are available.
Explanation: APN level overload control is used to advertise overload information at an APN level granularity, allowing mitigation policies to be applied specifically to the signalling traffic related to that APN. This enables more targeted and efficient management of network resources.