To perform a count up with the digital clock, the function indicator must be over which label?

The correct answer is indicated by the function that must be selected to perform a count-up with the digital clock, which is the elapsed time (ET) label. When the function indicator is set to ET, the digital clock will track the time that has passed since the timer was started, allowing for a straightforward count-up from that point.

The other labels such as flight time (FT), Greenwich Mean Time (GMT), and Coordinated Universal Time (UTC) serve different purposes. FT would display the total time in flight; GMT and UTC relate to standard times used around the world and would not function in a way that supports a counting up action specific to elapsed time during a flight or operation. Selecting the ET function enables operators to monitor elapsed times effectively during training or operational scenarios.