Final answer:
To select multiple controls, press and hold the Ctrl key while clicking additional controls, releasing the key after selection.
Step-by-step explanation:
To select multiple controls on a computer interface, you would click a control, and then press and hold the Ctrl key and then click the additional controls you want to select. You would release the key once all the controls are selected. The correct answer from the options provided is 2) Ctrl. This key is commonly used for selecting multiple items in a range of software applications, including word processors, file managers, and graphic design tools.
To select multiple controls, you would click a control, and then press and hold the Ctrl key and then click the additional controls you want to select, releasing the key once all the controls are selected.