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【单选题】
R 3 (n) 和 R 4 (n) 的线性卷积和为A.
u(n)+u(n-1)+u(n-2)
B.
R 4 (n)+R 4 (n-1)+R 4 (n-2)
C.
R 3 (n)+R 3 (n-1)+R 3 (n-2)
D.
R 3 (n)+R 3 (n-1)+R 3 (n-2)+R 3 (n-3)
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