GPS (Global Positioning System) technology has numerous applications in diverse fields.
Option 1: Mobile phone operations often use GPS for location services, navigation and tracking. So, option 1 is correct.
Option 2: GPS technology is also employed in banking operations. For instance, some banks use GPS to locate the nearest ATMs or branches, or to facilitate location-based services. So, option 2 is also correct.
Option 3: GPS is used in monitoring and controlling power grids as it provides precise time synchronization necessary for data logging and fault detection. This makes option 3 correct as well.
Therefore, all three options are correct which implies that option 4 (1, 2, and 3) is the correct answer.