What is the sequence y(n) that results from the use of four point DFTs if the impulse response is h(n)={1,2,3} and the input sequence x(n)={1,2,2,1}?

• A. {9,9,7,11}
• B. {1,4,9,11,8,3}
• C. {7,9,7,11}
• D. {9,7,9,11}