Please choose the correct ending to complete the given sentence: Finance and Business: [header] How to clean an imac screen [title] Shutdown and unplug your imac. [step] Click the apple icon in the upper left corner of your imac screen. Then click " shut down.

Ending1: " if you have an ios device older than the ios 6.7 os or bigger, this can be done by clicking " apple device manager " or clicking " devices " from your device's dock. [substeps] Turn off the device you're going to use the cleanest find-appropriate system cleaner. Ending2: " turn off your apple screen (which you have accessible through your ios device). [substeps] If you don't have an ios device, you can plug one end of the usb cord into the port on the outside of your ios device. Ending3: " unplug the power cord from the back of your imac. [substeps] Additionally, unplug any other devices that are connected to your imac like speakers and hdmi cords. Ending4: " [title] Press and hold the power button. [step] Once it turns off, press and hold the power button until the apple logo appears.

Answer format: ending1/ending2/ending3/ending4