Find the points of inflection and discuss the concavity of the function.
?
A. inflection point at 
; concave downward on 
; concave upward on
B. inflection point at
; concave upward on
; concave downward on
C. inflection point at
; concave upward on
; concave downward on
D. inflection point at
; concave upward on
; concave downward on
E. inflection point at
; concave downward on
; concave upward on
Answer: E
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