Which of the following statement would work? Employee table has three columns: Empid, Lastname, and Salary. Rose wants to enter data for empid 59694, lastname Fong, but not salary. Which of the following statement would work? O a. Insert into Employee values (59694, 'Fong'," "); O b. Insert into Employee values (59694, 'Fong', 'NULL"); O c. Insert into Employee values (59694, 'Fong'); O d. Insert into Employee (Empid, Lastname) values (59694, 'Fong'); O e. Insert into Employee (Empid, Lastname, Salary) values (59694, 'Fong)