x and y are positive integers. If x^(4...

x and y are positive integers. If ` x^(4) + y^(4) + x^(2) y^(2) = 481 and xy = 12 ` then what is the value of ` x^(2) - xy + y^(2)` ?

A

16

B

13

C

11

D

15

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