If kSn is defined to be the product of (n+k)(n-k+1) for all positive integers k and n,which of the following expressions repressents (k+1)Sn+1?
(n+k)(n-k+2)
(n+k)(n-k+3)
(n+k+1)(n-k+2)
(n+k+2)(n-k+1)
(n+k+2)(n-k+3)
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(n+1+k+1)*(n+1-(k+1)+1)
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(n+1+k+1)*(n+1-(k+1)+1)
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