In the xy-plane, the graph of the function f(x) = x2 + bx + 4 does not intersect the x-axis. Which of the following must be true about b?
A. âˆ’8 â‰¤ b < âˆ’4
B. b = âˆ’4
C.âˆ’4 < b < 4
D.b = 4
E. 4 < b â‰¤ 8
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