Which of the following is correct (a) The number of diagonals that can be drawn by joining the v...

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Which of the following is correct
(a) The number of diagonals that can be drawn by joining the vertices of an octagon is 28 .
(b) If a polygon has 54-diagonals, the number of its sides is 9.
(c) In a polygon no three diagonals are concurrent. If the total number of points of intersection of diagonals interior to the polygon be 70 then the number of diagonals of the polygon is 20 .
(d) All above are correct.
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