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Consider the function f(x, y) = rytry try. Which of the following statements are true for f? SELECT ALL TRUE STATEMENTS. Select 2 correct answer(s) O a) (0,-1) and (-1,0) are the only critical points of f. Ob) (-1/3, -1/3) is a local maximum for f. O c) (0,0) and (-1,0) are saddle points for f. O d) (-1,0) is the only crital point of f. Oe) (0,0) is a local maximum for f. Of) (0,-1) and (-1,0) are local minima for f. O g) (0,-1) is a local maximum for f