Match List-I with List-II ) and select the correct answer using the options given below:

List-I (Input-output relation)	List-II (Property of the system)
a. y(n) = x(n)	1. Nonlinear, non-causal
b. y(n) = x(n2)	2. Linear, non-causal
c. y(n) = x2(-n)	3. Linear, causal
d. y(n) = x2(n)	4. Nonlinear, causal