Some rows of a User table are shown below:   User ucode name phone scode 7 Alex 847 - 3902 UX 8 Tony 203 - 3902 PX 9 Charles ​ BD 11 Mary 877 - 3333 BD   Which of the following queries retrieves the rows where there is no phone? ​   a. SELECT * FROM User WHERE phone IS NULL   b. SELECT * FROM User WHERE phone = “ ”   c. SELECT * FROM User WHERE phone NOT IS NULL   d. SELECT * FROM User WHERE phone > 0

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