Find the values of x for which the given function is concave up, the values of x for which the function is concave down, and any points of inflection.y = 6x3 + 2x + 6
A. Concave down for all x, no points of inflection
B. Concave up for all x, no points of inflection
C. Concave down for x < 0, concave up for x > 0, point of inflection at (0, 6)
D. Concave up for x < 0, concave down for x > 0, point of inflection at (0, 6)
Answer: C
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