xy=1 then what is (4^(x+y)^2) / (4^(x-y)^2) Choose the correct choice from the following options:
A) 2
B) 4
C) 8
D) 256
E) 32

Rationale: "( x + y ) ^ 2 - ( x - y ) ^ 2 ( x + y + x - y ) ( x + y - x + y ) ( 2 x ) ( 2 y ) 4 xy 4 4 ^ 4 = 256 answer d"
Answer: D