Consider the following statements.
a. an entity integrity constraint states that no primary keyvalue can be null.
b. a referential integrity constraint is specified between tworelations.
c. a foreign key cannot be used to refer to its ownrelation.
identify which of the above statements is/are correct.
? only a
? only b
? only b and c
? only a and b

Ihave 25$ on an itunes card and i need to buy spotify premium, i have no other payment method.

How does a policy manual an organization? a. it boost productivity. b. it create awareness in employees about the organization’s values. c. it employees achieve targets. d. it safeguards the organization from liabilities.

Which is the correct sequence of steps to set up a document in landscape orientation? a. select page setup from the file menu. then click the margins tab and select landscape. b. select page setup from the edit menu. then click the margins tab and select landscape. c. select page setup from the insert menu. then click the margins tab and select landscape. d. select page setup from the format menu. then click the margins tab and select landscape