Which of the Following Will Allow a User to Enter

Multiple Choice

Which of the following will allow a user to enter a NULL value using the INSERT command?​

A) ​Omit the column from the column list in the INSERT INTO clause.
B) ​Substitute two single quotation marks in the VALUES clause in the position of the column that is to be assigned the NULL value.
C) ​Use the NULL keyword.
D) ​all of the above