In which of the following areas can GPS technology be used? 1. Mobile phone operations 2. Banking operations 3. Controlling the power grids Select the correct answer using the code given below:

GPS technology is used in all three areas because it provides not only location data but also highly accurate atomic clock timing, which is essential for synchronizing mobile networks, timestamping financial transactions in banking, and managing phase measurements in power grids. Option (c) is the most tempting wrong choice for candidates who incorrectly assume GPS is limited to navigation and overlook its critical "precision timing" role in financial security and auditing. The core concept being tested is the application of GPS-based time synchronization in critical national infrastructure beyond simple positioning.