Consider 8 vertices of a regular octagon and its centre. If \( \mathrm{T} \) denotes the number ...

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Consider 8 vertices of a regular octagon and its centre. If \( \mathrm{T} \) denotes the number of triangles and \( \mathrm{S} \) denotes the number of straight lines that can be formed with these 9 points then \( T-S \) has the value equal
\( \mathrm{P} \) to
(A) 52
(B) 56
(C) 48
(D) 44
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