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Consider a circle `x^2+y^2+a x+b y+c=0` lying completely in the first quadrant. If `m_1a n dm_2` are the maximum and minimum values of `y/x` for all ordered pairs `(x ,y)` on the circumference of the circle, then the value of `(m_1+m_2)` is (a)`(a^2-4c)/(b^2-4c)` (b) `(2a b)/(b^2-4c)` (c)`(2a b)/(4c-b^2)` (d) `(2a b)/(b^2-4a c)`

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