Which is not necessary when using bar codes in supermarkets?

1.	Which is not necessary when using bar codes in supermarkets?
A.	Point-of sale (POS) terminal
B.	Check digit on the bar code
C.	Price on the shelf
D.	Price on the goods
E.	None of the above
Answer» D. Price on the goods

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Which is not necessary when using bar codes in supermarkets?

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