Determine the x values that cause the function to be (a) zero, (b) undefined, (c) positive, and (d) negative.f(x) = 
A. (a) {-9}, (b) 
, (c) (-?, -9) ? 
, (d) (-9, -2) ? 
B. (a) {-9}, (b) 
, (c) (-9, -2) ? 
, (d) (-?, -9) ? 
C. (a) 
, (b) {-9}, (c) (-?, -9) ? 
, (d) (-9, -2) ? 
D. (a) 
, (b) {-9}, (c) (-9, -2) ? 
, (d) (-?, -9) ? 
Answer: D
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