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DATABASE MANAGEMENT SYSTEMDiscuss about different keys used in database design with examples20247mDatabase Management SystemKey to represent relationship between tables is called (i) primary key (ii) secondary key (iii) foreign key (iv) None of the above20202mDatabase Management SystemWhich of the following is true? (i) a super-key is always a candidate key. (ii) every 3NF schema is also a BCNF. (iii) generalization is bottom-up approach. (iv) none of these.20222mDatabase Management SystemWhat is a foreign key? (i) A foreign key is a primary key of a relation which is an attribute in another relation (ii) A foreign key is a superkey of a relation which is an attribute in more than one other relations (iii) A foreign key is an attribute of a relation that is a primary key of another relation (iv) A foreign key is the primary key of a relation that does not occur anywhere else in the schema20182m