Evaluate :$\lim\limits_{x\to \Large\frac{\pi}{4}}\large\frac{\sqrt 2-\cos x-\sin x}{(4x-\pi)^2}$

Question

$(a)\;1/16\sqrt 2\qquad(b)\;1/\sqrt 2\qquad(c)\;1/16\qquad(d)\;1$