Question: What is used to describe the GMM protocol of the Mobile Station (MS) and the network in terms of state machines?
Option 1: A single state machine
Option 2: Three different state machines
Option 3: Two different state machines
Option 4: Four different state machines
Explanation: The GMM protocol is described by means of two different state machines, one for the MS and another for the network. This allows for a clear understanding of the behavior of both the MS and the network in terms of GPRS mobility management.