Determine the t intervals on which the curve ,  is concave downward or concave upward.
?

A. concave downward: ; concave downward:
B. concave downward: ; concave upward:
C. concave downward: ; concave upward:
D. concave downward: ; concave upward:
E. concave downward: ; concave upward:

Answer: A

Mathematics

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