1. Registration_Num: Unique registration number

   of each registered student

2. UID: Unique identity number, unique at the 

   national level for each citizen

3. BankAccount_Num: Unique account number at

   the bank. A student can have multiple accounts

   or join accounts. This attribute stores the 

   primary account number.

4. Name: Name of the student

5. Hostel_Room: Room number of the hostel 

Which one of the following option is INCORRECT?

A.BankAccount_Num is candidate key

B.Registration_Num can be a primary key

C.UID is candidate key if all students are from the same country

D.If S is a superkey such that S∩UID is NULL then S∪UID is also a superkey

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