A colleague wants to leave the computer briefly but keep their current programs open, and they want the screen inaccessible to others. Which option should they choose, and why is it preferable to Log off or Shut down?

The best choice is **Lock**, because the colleague wants to restrict access while preserving the active session and open programs. **Log off** would close the programs and end the session, and **Shut down** would also turn off the computer. Sleep retains programs in a low-power state, but the scenario specifically calls for making access require a password, which is the defining purpose of Lock in the material. **Key takeaway:** Use Lock for a brief absence when you want to protect access and keep work running.\n\n**Glossary:**\n- **Lock**: A state that blocks access until the user authenticates again, without closing programs.\n- **Log off**: An action that closes programs and ends the current user's session.\n- **Shut down**: An action that closes programs and turns off the computer.