Consider the function f(x)=x2+c−3x−4f(x) = \frac{\sqrt{x^2+c} - 3}{x-4}f(x)=x−4x2+c−3. If limx→4f(x)=43\lim_{x \to 4} f(x) = \frac{4}{3}limx→4f(x)=34, what is the value of ccc?
c=5c = 5c=5
c=−7c = -7c=−7
c=−9c = -9c=−9
c=2c = 2c=2