A. Let f(x, y, z) = z²-x² - y² .The set of all values of c such that the level surface f(x, y, z) = c²-2c-3 intersects x - y plane in a circle 1- (-∞, -1) U (3,00) 2- (1,3) 3-(-1,3) 4-(1,-3). ling

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