Question: Which one is a causal system?
Options
A : y ( n ) = 3 x [ n ] - 2 x [ n - 1]
B : y ( n ) = 3 x [ n ] + 2 x [n + 1]
C : y ( n ) = 3 x [ n + 1] + 2 x [ n - 1]
D : y ( n ) = 3 x [ n + 1] 2 x [ n - 1] + x [ n ]
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