The correct answer is A. Button control.
A button control is a graphical control element that is used to initiate an action when clicked. It is commonly used in user interfaces to allow users to interact with a program.
A close button is a graphical control element that is used to close a window or dialog box. It is typically located in the upper-right corner of the window.
An end button is a graphical control element that is used to end a program. It is typically located in the upper-right corner of the program window.
An exit button is a graphical control element that is used to exit a program. It is typically located in the upper-right corner of the program window.
Button controls are the most common type of control used to perform an immediate action when clicked in Visual Studio. They are easy to use and can be customized to fit the needs of the user interface.