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| Q. |
Which of the following can be addressed by enforcing a referential integrity constraint? |
| A. | all phone numbers must include the area code |
| B. | certain fields are required (such as the email address, or phone number) before the record is accepted |
| C. | information on the customer must be known before anything can be sold to that customer |
| D. | then entering an order quantity, the user must input a number and not some text (i.e., 12 rather than ‘a dozen’) |
| Answer» C. information on the customer must be known before anything can be sold to that customer | |
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