The common difference of an A.P., the sum of whose \( n \) terms is...

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The common difference of an A.P., the sum of whose \( n \) terms is \( S_{n} \), is
(a) \( S_{n}-2 S_{n-1}+S_{n-2} \).
(b) \( S_{n}-2 S_{i-1}-S_{i-2} \)
(c) \( S_{n}=S_{n-2} \)
(d) \( \mathfrak{S}_{n}-\mathfrak{S}_{n-1} \)
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