1Draw the corresponding ERD for the following Employee Database2Normalize the following Schema with the given functional dependencies into BCNF3Explain in your own words why the Student-Dept relation is not in 4NF. Then, convert the Student-Dept relation in 4NF. Also, provide the justification for each step you perform during normalization (4NF). Note: The SportActivity here means any sport a student is participating in. For example, a student with ID = 123 can participate in soccer and badminton4In your own word, explain why do designers use Denormalization? What is the limitation of using Denormalization? Name and explain a better alternative approach than Denormalization.