Which of the following is the correct example of adding a new column CONTACT_NOdatatypeNUMBER size 11 to EMPLOYEES table?

• ALTER TABLE EMPLOYEESADD CONTACT_NO NUMBER;
• ALTER EMPLOYEESADD CONTACT_NO NUMBER(11);
• ALTER TABLE EMPLOYEESADD COLUMN CONTACT_NO NUMBER(11);
• ALTER TABLE EMPLOYEESADD CONTACT_NO NUMBER(11); Correct