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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