Which of the following is the difference equation of the FIR filter of length M, input x(n) and output y(n)?

y(n)= ( sum_{k=0}^{M+1} b_k x(n+k) )

y(n)= ( sum_{k=0}^{M+1} b_k x(n-k) )

y(n)= ( sum_{k=0}^{M-1} b_k x(n-k) )

Which of the following is the difference equation of the FIR filter of

1.	Which of the following is the difference equation of the FIR filter of length M, input x(n) and output y(n)?
A.	y(n)= ( sum_{k=0}^{M+1} b_k x(n+k) )
B.	y(n)= ( sum_{k=0}^{M+1} b_k x(n-k) )
C.	y(n)= ( sum_{k=0}^{M-1} b_k x(n-k) )
D.	None of the mentioned
Answer» D. None of the mentioned