What is the proper method for inserting a value into a column assigned a data type of SERIAL?

What is the proper method for inserting a value into a column assigned a data type of SERIAL?
A . Set the program variable for the serial column to NUL
C . Set the program variable for the serial column to zero.
D . Set the program variable for the serial column to the next highest value of the SERIAL column.
E . Exclude the program variable for the serial column from the INSERT statement enabling the database to insert the correct SERIAL value.

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Answer: B