Let X and Y be two random variables. They are such that any set of joint observations of X and Y will lie along a straight line with slope -1. Let rho be the correlation coefficient between X and Y. Beta2 and R2 come from the following regression using Y and X: Y = beta1 + beta2*X +U. Which of the following is true? O rho=1 O R2=1 O R2=-1 O beta2=1