Final answer:
Resetting a school Chromebook without authorization is not advised and could violate school policies. Backing up data and performing a factory reset will erase all information, but school monitoring systems may detect the reset.
Step-by-step explanation:
Resetting a school Chromebook without the knowledge of the school administration or tech support is generally not recommended and could be against school policies. Despite this, if one needs to reset their Chromebook for legitimate reasons, they should first back up any necessary data and then perform a factory reset (D). Performing a factory reset will delete all the information on the Chromebook, including any traces of the user's activities and user profiles. However, it should be noted that many school-managed devices have monitoring systems and may keep logs that can indicate that a reset was performed.
Options such as using a guest account (A) or resetting in incognito mode (B) will not remove user data or reset the Chromebook to its original factory settings. The most appropriate and responsible action would be to contact tech support (C) for assistance if the Chromebook is not functioning as needed. Tech support is equipped to handle such situations in accordance with school policies.