8- Which statement(s) on the function f(x, y, z) = x + xy - xy2z+z is...

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8- Which statement(s) on the function f(x, y, z) = x + xy - xy2z+z is true? 1)f has exactly one critical point, namely a local minimum II) f has exactly one critical point, namely a local maximum III) f has exactly one critical point, namely a saddle point IV) f has multiple critical points a) None c) IV d) || 8- Which statement(s) on the function f(x, y, z) = x + xy - xy2z+z is true? 1)f has exactly one critical point, namely a local minimum II) f has exactly one critical point, namely a local maximum III) f has exactly one critical point, namely a saddle point IV) f has multiple critical points a) None c) IV d) ||