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If (mr , 1/mr), r = 1, 2, 3, 4 are concy...

If `(m_r , 1/m_r), r = 1, 2, 3, 4` are concyclic points and `f(x) = x`, when `x` is rational `= 1 - x`, when `x` is irrational and `a` is a point where `f(x)` is continuous, then `m_1 m_2 m_3 m_4 =` (A) `a` (B) `2a` (C) `-2a` (D) none of these

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