In a concave quadrilateral, let the two line segments joining the opposite vertices be represented by d₁ and d₂, then
a) both d₁ and d₂ lie in its interior
b) both d₁ and d₂ lie in its exterior
c) some part of d₁, d₂ lies in the interior and some of it in the exterior
d) one of d₁ and d₂ lies in interior and other in exterior
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