Use the following create statement to answer the next 5 questions. create table emp ( A int, B int, C int, D int, E int, F int not nul1 references dept(dno), unique (D, E ), primary key (A, B, , , foreign key E references project(pno)) 1. How many primary keys are there in table emp? a. 1 b. 2 c. 3 d. 4 2. How many keys are there in table emp? a. 1 b. 2 c. 3 d. 4 3. How many foreign keys are there in table emp? a. 1 b. 2 c. 3 d. 4 4. What is the primary key of table dept? a. A,B,C b. F c. dno d. pno 5. What should be added to the above create statement to do the following: "If a department is deleted, also delete all its employees". a. on delete restrict b. on delete set default c. on delete set null d. on delete cascade