If f(x)=x^2 and x is a positive integer, which of the following CAN be the value of f(f(x))?
Select.
A) 25	B) 17	C) 81	D) 144	E) 258
f(x)=x^2   f(f(x)) = (x^2)^2   f(f(3) = (3^2)^2 = 81   Answer 81
<result>C</result>
If f(x)=x^2 and x is a positive integer, which of the following CAN be the value of f(f(x))?