Test for relative maximum and minimum.
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A. relative maxima when x = 7, y = -8 and x = 7, y = 8; relative minima when x = -7, y = 8 and x = -7, y = -8
B. relative maximum when x = 7, y = -8; relative minimum when x = -7, y = 8
C. saddle point when x = -7, y = -8; relative minima when x = 0, y = 0 and x = -7, y = -8
D. saddle points when x = 7, y = -8 and x = -7, y = 8; relative maximum when x = -7, y = -8; relative minimum when x = 7, y = 8
E. saddle points when x = 7, y = 8 and x = -7, y = -8; relative maxima when x = 7, y = -8 and x = -7, y = 8
Answer: D
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