John is using a spreadsheet program. He needs to select two cells that are non-adjacent to one another. He is currently holding down the "Shift" key while clicking on the two cells. Interpret John's mistake.

John is using a right click when he should be using a left click

John should be holding the "Alt" key instead of the "Shift" key

John is not making any mistakes

John should be holding the "Ctrl" key instead of the "Shift" key