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. −8 ≤ b < −4B. b = −4C.−4 < b < 4D.b = 4E. 4 < b ≤ 8I would need a comprehensive explanation on how you arrived at your answer so I'll know how to it the next time around. Thanks!