Consider a data model for the Olympics storing information about countries and athletes. There is a 1:N relationship type between country and athlete and an athlete always has to belong to exactly one country. A relational data model containing only one table leads to:

a. Unnecessary replication of data about athletes.

b. Unnecessary replication of data about countries.

c. Unnecessary replication of data about athletes and countries.

d. No unnecessary replication of data.