Question: Which statement is true about NULL values? The result of arithmetic operation on two values is NULL when either value is NULL A NULL is

Which statement is true about NULL values?
The result of arithmetic operation on two values is NULL when either value is NULL
A NULL is represented as a blank in character data and zero in numeric data
Part of a Primary key (PK) can have NULL value if the PK is composed of more than two fields
All of the above

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