Which of the following is a recursive form of a non-recursive system described by the equation y(n)=\(\frac{1}{M+1} \sum_{k=0}^Mx(n-k)\)?

• A. y(n)=y(n-1)+\(\frac{1}{M+1}\)[x(n)+x(n-1-M)]
• B. y(n)=y(n-1)+\(\frac{1}{M+1}\)[x(n)+x(n-1+M)]
• C. y(n)=y(n-1)+\(\frac{1}{M+1}\)[x(n)-x(n-1+M)]
• D. y(n)=y(n-1)+\(\frac{1}{M+1}\)[x(n)-x(n-1-M)]