If the three lines $p_1x + q_1y = 1$,$p_2x + q_2y = 1$,and $p_3x + q_3y = 1$ are concurrent,then the points $(p_1, q_1)$,$(p_2, q_2)$,and $(p_3, q_3)$ are:
- AVertices of a right-angled triangle.
- BVertices of an equilateral triangle.
- CVertices of an isosceles triangle.
- DCollinear.
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