identify primary and secondary key

Identify primary key using one underline, foreign key using two underlines, and candidate key using circle for each of the following databases University Database Student (Stuid, Stuname, Major, Credits) Class (Course#, Facid, Sched, Room) Faculty (Facid, Facname, Dept, Rank) Enrollment (Course#, Stuid, Grade, Sdate) Assumption: Course# is unique from semester to semester Student (Stuid, Stuname, Major, Credits) Class (Course#, Sdate, Facid, Sched, Room) Faculty (Facid, Facname, Dept, Rank) Enrollment (Course#, Stuid, Grade, Sdate) Assumption: Course# is the same from semester to semester Rental Database Branch (Bno, Street, Area, City, Pcode, Tel_No, Fax_No) Staff (Sno, FName, LName, Address, Tel_No, Position, Sex, DOB, Salary, NIN, Bno) Property for Rent (Pno, Street, Area, City, Pcode, Type, Rooms, Rent, Ono, Sno, Bno) Renter (Rno, Fname, Lname, Address, Tel_No, Pref_Type, Max_Rent) Owner (Ono, Fname, LName, Address, Tel_No) Viewing (Rno, Pno, Sno, Date, Comment) Financial Agency Database Customer (custid, name, address, phone, email, driverid) Employee (empid, name, address, DOB, phone, email) Stock&Bond (st&bocode, description, type, date, high, low, avg, volume) Transaction (tranid, custid, empid, st&bocode, date, price, buy/sale, volume, profit, fee) Car Rental Database Renter (Renterld, Name, DriverLNo, SSNo, Address, Email, DOB, Insuranceld) Staff (Staffld, Name, SSNo, DriverLNo, Address, Email) Contract (Contractld, Renterld, Stafild, Vehicleld. Sdate, Fdate, Rate) Vehicle (Vehicleld, Brand, Model, Year, Purchase Date)