By means of the DFT and IDFT, determine the response of the FIR filter with impulse response h(n)={1,2,3} to the input sequence x(n)={1,2,2,1}?

• A. {1,4,11,9,8,3}
• B. {1,4,9,11,8,3}
• C. {1,4,9,11,3,8}
• D. {1,4,9,3,8,11}