Which of the following identifies changes in the environment, such as alternating current failure?

Ann, a user, has asked technician for help with her computer. Ann has been trying to speed it up with simple Upgrades but has not been successful. She added memory and removed unnecessary applications that were no longer in use. After removing the applications, however, the computer seemed to get slower. Which of the following is the BEST solution?

An administrator needs to uninstall an update on a Windows 7 computer. Which of the following Control Panel utilities would make this possible?

Which of the following would MOST likely be connected to a computer to provide electricity in case of a blackout?

Which of the following extensions identify files that are typically implemented as scripts? (Choose two.)