DataBase Help & just give me the final answer

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Which of the following statement is True about DDL statment? O A. DDL statements are used to increase the quality of the data in the database O B. DDL statements are used to create, change, and remove the objects of file system.. O C. DDL statements are used to increase the performance of the database O D.DDL statements are used to create, change, and remove the objects of Databases. Write down a SQL query to create a table with the following specifications. Create a table named Student with the attributes Std_id 10 digit long, Ste_name 30 characters long, Std_dept 10 characters long Std email 20 characters long Add PRIMARY KEY constraint on Std Id. Add UNIQUE constraint on Std email. Add NOT NULL constraint on Std_dept. Which of the following is not an advantage of the DBMS over file system O Reduce complexity O Reduce redundancy o Improved data integrity O Improved data security