If the circle $x^2 + y^2 = a^2$ cuts off a chord of length $2b$ from the line $y = mx + c$,then
- A$(1 - m^2)(a^2 + b^2) = c^2$
- B$(1 + m^2)(a^2 - b^2) = c^2$
- C$(1 - m^2)(a^2 - b^2) = c^2$
- DNone of these
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