If f(x)=sin(ax)xf(x) = \frac{\sin(ax)}{x}f(x)=xsin(ax) for x≠0x \neq 0x=0 and f(0)=kf(0) = kf(0)=k, for what kkk is fff continuous at 000?
k=0k=0k=0
k=1k=1k=1
k=ak=ak=a
k=a2k=a^2k=a2