Question Let X, Y, and Z be random variables and let a, b, and c be positive or negative constants. What is Cov(aX + bY + c, Z)? Possible Answers A a Cov(X, Z) + b Cov(Y, Z) B a Cov(X, Z) + b Cov(Y, Z) + c C a Cov(X, Z) + b Cov(Y, Z) + c Var(Z) D lal Cov(X, Z) + Ibl Cov(Y, Z) E lal Cov(X, Z) + Ibl Cov(Y, Z) + Icl