If x = sqrt(a) + (1)/( sqrt(a)) , y = s...

If ` x = sqrt(a) + (1)/( sqrt(a)) , y = sqrt(a) - (1)/( sqrt(a)) ( a gt 0)` then the value of
`(x^(4) + y^(4) - 2 x^(2) y^(2))` is

A

16

B

20

C

10

D

5

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