Question: In Iu mode, what are the three levels at which the tracking of a Mobile Station's (MS) location is performed by the network?
Option 1: Cell, Location Area, or Public Land Mobile Network (PLMN)
Option 2: Cell, RAN registration area, or Routeing Area (RA)
Option 3: Cell, Service Area, or Geographic Location
Option 4: PLMN, Location Area, or Service Area
Explanation: In Iu mode, the network tracks an MS's location on three levels for efficient mobility and resource management: Cell (most granular), RAN registration area (broader, encompassing multiple cells), and Routeing Area (RA) for routing data, especially in idle modes or when precise location information is unavailable, optimizing resource usage and facilitating seamless handovers.