Three basic types of database integrity constraints are:
(a)Entity integrity
(b) Domain integrity
(c) Referential integrity
(d) Primary key integrity
a. (a) and (b) and (c) are true
b. (a) and (b) and (d) are true
c. (a) and (c) and (d) are true
d. (b) and (c) and (d) are true
Answer: A