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Let x, y be real variable satisfying the...

Let x, y be real variable satisfying the `x^2 + y^2 + 8x - 10 y - 40 = 0` Let ` a = max{(x + 2)^2 + (y - 3)^2}` and `b = min{(x + 2)^2 + (y - 3)^2}`, then

A

a + b = 18

B

`a + b = sqrt 2`

C

`a - b = 4 sqrt2`

D

`a cdot b = 73`

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A, C, D
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