Which of the following statements are true? Choose all that apply.

		The covariance of any asset with the risk-free asset is zero.
		Correlation(A,B) = 0 if and only if either Variance(A) = 0 or Variance(B) = 0.
		Correlation(A,B) = 1 if and only if either Variance(A) < 0 or Variance(B) < 0.
		Correlation(A,B) = +1 if and only if Variance(A) = Variance(B).