which statement about entity and attribute is correct?

a. an attribute is one aspect of the entity that we want to keep track of

b. an entity is an aspect of the attribute that we want to keep track of

c. a composite attribute should be depicted in the ERD as an entity

d. an entity cannot have composite attributes

d. none of the above

what can an ED diagram be used for?

i. it can determine whether the data requirements are correct

ii. it documents the data requirements pictorially

iii. it can be used to communicate with users about the data requirements gathered thus far

iv. it can help uncover missing data requirements

a. i and iv

b. ii and iii

c. ii, iii, and iv

d. i, ii, iii and iv