The correct answer is: A. Timer tool
A timer control is a graphical control element that allows users to set and start a timer. When the timer is started, it will start counting down from the set time. When the timer reaches zero, it will generate an event that can be handled by the application.
The timer tool is used to create timer controls. To create a timer control, select the timer tool from the toolbox and then click on the form where you want to place the timer control. The timer control will be added to the form and you can then set its properties in the Properties window.
The properties of a timer control include:
- Interval: The interval in milliseconds between timer ticks.
- Enabled: A Boolean value that indicates whether the timer is enabled.
- EnabledChanged: An event that is raised when the enabled property changes.
- Tick: An event that is raised when the timer ticks.
The timer control can be used to create a variety of applications, such as stopwatches, countdown timers, and alarms.
The other options are incorrect because:
- Option B, Control tool, is used to create control objects.
- Option C, Stopwatch tool, is used to create stopwatch objects.
- Option D, Timer Control Tool, is not a valid option.