1. Consider the following un-normalized table which contains the following attributes:

Staff-Account Table

Staff-ID	StaffName	Age	AccountNo	Balance	AccountType	BranchID	Address
28	Ahmed	25	C007	1000	Current	B12	Rifaa
31	Mohammed	57
36	Saeed	33	S493	2000	Saving	B13	Manama
			C200	3000	Current	B12	Rifaa
41	John	29	C510	1500	Current	B15	Zallaq
42	Fatima	40	S289	700	Saving	B13	Manama

Note that

One employee may have more than one account (like Saeed) and one account can be a joint account owned by two persons (like accountNo 007).

Produce the 1NF tables? What is the primary key at this level?