Which of the following determines whether the user pressed a key that is not a number or the Backspace key? a. If (e.KeyChar < "0" AndAlso e.KeyChar > "9") OrElse e.KeyChar <> ControlChars.Back Then b. If e.KeyChar < "0" AndAlso e.KeyChar > "9" OrElse e.KeyChar <> ControlChars.Back Thenc. If (e.KeyChar < "0" OrElse e.KeyChar > "9") AndAlso e.KeyChar <> ControlChars.Back Then d. If e.KeyChar < "0" OrElse e.KeyChar > "9" AndAlsoe.KeyChar <> ControlChars.Back Then

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Linux

An operating system (OS) is the software which manages hardware and resources, like CPU, storage and memory. The OS bridges the applications and hardware and makes the connections between all of your software and the hardware resources.