The function H(x, y) = x4 - 9y2 - 2x2y + 20y + 4 has
A. a relative minimum at the point (0, 0)
B. neither a relative maximum nor minimum at (1, 4)
C. a relative maximum at the point (0, 1)
D. a relative maximum at the point (-1, 1)
E. none of these
Answer: E
Mathematics
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