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If x and y are two random variables and a, b, c, d are any numbers provided a ≠ 0, c ≠ 0, then correlation co-efficient between ax + b and cy + d is -

A r (ax + b, cy + d) = (ab/cd) r(x, y)

B r (ax + b, cy + d) = (ac/bd) r(x, y)

C r (ax + b, cy + d) = (|ac/bd|) r(x, y)

D r (ax + b, cy + d) = (ac/|ac|) r(x, y)

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