Question: In the context of General Packet Radio Service (GPRS), what constitutes a 'route' for the transfer of messages within and between Public Land Mobile Networks (PLMNs)?
Option 1: A single node responsible for message transmission, identified by a set of rules.
Option 2: An unordered list of nodes used for message transfer, with no defined originating or destination point.
Option 3: An ordered list of nodes, including the originating node, zero or more relay nodes, and the destination node, used for message transfer.
Option 4: A set of rules governing message transmission, without reference to specific network nodes.
Explanation: This option accurately reflects the definition provided, emphasizing that a route in GPRS consists of an ordered sequence of nodes: the starting point (originating node), possible intermediate points (zero or more relay nodes), and the endpoint (destination node). This structured approach ensures efficient and directed message transfer within and between PLMNs.