Question: In a relation, NULL may represent:A . A value for an attribute that is too large for the databaseB. A value for an attribute that

In a relation, NULL may represent:A

.

A value for an attribute that is too large for the databaseB. A value for an attribute that is currently unknownC. A value for an attribute that is not applicable for the tupleD. A value for an attribute that is equal to zeroE. A value that is too small and hence not useful

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