Computer Basic Information
Which is not necessary when using bar codes in supermarkets?

Point-of sale (POS) terminal
Price on the goods
Check digit on the bar code
None of these
Price on the shelf

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Computer Basic Information
The essential difference between an operating system like Linux and one like Windows is that

None of these
Linux is proprietary, whereas Windows is not.
any programmer can modify Linux code, which is not permitted with Windows.
there are multiple versions of Linux, but only one version of Windows.
Windows can run with an Intel processor, whereas Linux cannot.

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