Computer Basic Information
A beam of light used to record and retrieve data on optical disks is known as

polarized light
laser
coloured light
unpolarized concentric light
None of these

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Computer Basic Information
Hardware includes ..........

sets of instructions that a computer runs or executes.
all devices used to input data into a computer.
all devices involved in processing information including the central processing unit, memory and storage.
the computer and all the devices connected to it that are used to input and output data.
None of these

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