Question: a . It is a variable for holding database relation data, not the relation itself. b . It has an attribute with a value that

a. It is a variable for holding database relation data, not the relation itself.
b. It has an attribute with a value that determines the value of other rows.
c. An index is an orderly arrangement used to physically access rows in a table.
d. An index is an orderly arrangement used to logically access rows in a table.
a. It is a variable for holding database relation data, not

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