Which of the following true ({.} denotes the fractional part of the function)? (a)`("lim")_(xtooo)((log)_e x)/({x})=oo` (b) `("lim")_(xto2^+)x/(x^2-x-2)=oo` (c)`("lim")_(xto1^-)x/(x^2-x-2)=-oo` (d) `("lim")_(xtooo)((log)_(0 .5) x)/({x})=oo`