Question:Which of the following is the best way to modify a table to allow null values? 

A ALTER TABLE table_name MODIFY column_name varchar(255) null 
B ALTER TABLE table_name MODIFY column_name VARCHAR(255) 
C ALTER TABLE table_name CHANGE column_name column_name type DEFAULT NULL 
D ALTER table_name MODIFY column_name varchar(255) null 

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A 

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Mohammad Towhidul Islam

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