In the notation Ctrl+S, what does the plus sign mean?

### Why this is right The material defines `+` as the convention for keys pressed at the same time. Therefore, Ctrl+S means hold Ctrl while pressing S. ### The concept A shortcut combines keys to issue a command. The plus sign describes simultaneous key presses, not a literal plus-key press or a sequence of separate presses. ### The other options - **B. Press Ctrl, release it, then press S**: describes sequential presses, not the notation in the material. - **C. Press S twice**: omits Ctrl and does not match the shortcut. - **D. Press the plus key between Ctrl and S**: treats notation as a literal key instruction. ### Terms - **Ctrl**: the Control key, which modifies another key's function in many shortcuts. ### Remember A plus sign in shortcut notation means simultaneous keys.