This question requires that you evaluate the underlined text to determine if it is correct.
A relational database management system employs the concept of an attribute to ensure that data entered into a field in a column is valid.
Instructions: Review the underlined text. If it makes the statement correct, select “No change is needed.” If the statement is incorrect, select the answer choice that makes the statement correct.
A. No change is needed
B. a primary key
C. a constraint
D. an index
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