Correlation is a statistical measure of the relationship between a series of numbers representing data. Which of the following statements about correlation is (are) correct?

I.Perfectly negatively correlated describes two negatively correlated stocks that have a correlation coefficient of -1.

II. Perfectly positively correlated describes two positively correlated stocks that have a correlation coefficient of 0.

a. Only statement I is correct.

b. Neither statement I nor II is correct.

c. Only statement II is correct.

d. Both statements I and II are correct.