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

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

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Computer Basic Information
What is backup?

Protecting data by copying it from the original source to a different destination
None of these
Accessing data on tape
Filtering old data from the new data
Adding more components to your network

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