What is the solution to this problem

Which of the following statements concerning the correlation coefcient {r} are true? it is a unitless measure of the linear association between two variables the range ofvalues it can take is not restricted a strong linear relationship. either positive or negative. between two variables indicates that one variable must cause changes in the other variable the correlation coefficient can take the value of1 or 1, or any value between 1 and 1. r = 0 indicates there is no linear relationship between the two variables = 1 indicates that all points on a scatter diagram could be connected by a downward sloping straight line = 0.? indicates a stronger linear relationship between the variables than if the correlation coefcient were 0.4