Which of the following is equal to Cov (X + Y, 2X – Y), where X and Y are random variables on a sample space S ? (a) 2Var (X) – Cou (X, Y) – Var (Y) (b) 2Var (X²) + Cou (X, Y) – Var (Y²) (c) 2Var (X) – Cov (X, Y) + Var (Y) (d) 2Var (X) + Cov (X, Y) – Var (Y) - (e) None of the above

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