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:

  • A
    Vertices of a right-angled triangle.
  • B
    Vertices of an equilateral triangle.
  • C
    Vertices of an isosceles triangle.
  • D
    Collinear.

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