4. 已知函数f(x)={2x(x⩽1)log12x(x>1)f(x)=\left\{{\left.\begin{array}{l}{{2^x}(x\leqslant 1)}\\ {{{\log }_{\frac{1}{2}}}x(x>1)}\end{array}\right.}\right.f(x)={2x(x⩽1)log21x(x>1),则f(1−x)f(1-x)f(1−x)的图象是((( )))