Question: How can an IP v4 address be allocated to a Mobile Station (MS) in a Public Land Mobile Network (PLMN)?
Option 1: Only permanently, as part of the MS's initial configuration
Option 2: Either permanently or temporarily, depending on the connection with the network
Option 3: Exclusively temporarily, for the duration of a single data session
Option 4: Through a third-party address allocation service, not directly by the PLMN
Explanation: This is correct because, according to telecom principles for flexible resource management, IP addresses can be allocated in two primary modes to optimize resource utilization and accommodate varying user needs. Permanent allocation suits always-connected devices or those requiring consistent reachability, while temporary allocation is suitable for occasional or short-term connectivity, conserving IP address space within the PLMN.