Which condition ensures a function fff has a jump discontinuity at x=ax = ax=a?
limx→af(x)\lim_{x\to a}f(x)limx→af(x) exists but f(a)f(a)f(a) is undefined
limx→a+f(x)\lim_{x\to a^+}f(x)limx→a+f(x) and limx→a−f(x)\lim_{x\to a^-}f(x)limx→a−f(x) both exist but are unequal
limx→af(x)=±∞\lim_{x\to a}f(x) = \pm\inftylimx→af(x)=±∞
f′(a)f'(a)f′(a) does not exist