Which one is a causal system

y(n) = 3x[n] - 2x[n - 1]
 
y(n) = 3x[n] + 2x[n + 1]
 
y(n) = 3x[n + 1] + 2x[n - 1]
 
y(n) = 3x[n + 1] 2x[n - 1] + x[n]
 

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