Which gate numbering system is assigned to Terminal 1?

The correct answer indicates that the gate numbering system assigned to Terminal 1 at YYZ includes both the 100s and 200s. This gate numbering system aligns with the terminal's design and layout, where the gates are organized to facilitate efficient passenger movement and aircraft operations.

Terminal 1 has a number of gates designed to handle domestic and international flights, and the use of both the 100s and 200s allows for a logical breakdown of gates by different airline operations and destinations. This system helps passengers and airline staff easily identify departure and arrival gates.

In contrast, the other options do not accurately represent the gate structure of Terminal 1. For instance, the 300s and 700s are not part of Terminal 1's configuration, as these numbings relate to other terminals or specific areas within the airport complex. The presence of only 200s would also not encompass the full range of gate numbers available in Terminal 1, thereby validating that both 100s and 200s indeed characterize this terminal's gate assignments.