ok, so it seems to be the square root of the cube root of 2
we just convert to exponential
remember
\((x^m)^n=x^{mn}\) and
\(\sqrt[n]{x^m} =x^ \frac{m}{n}\)
therfor
\(\sqrt{ \sqrt[3]{2} }= \sqrt{2^ \frac{1}{3} } =( 2^ \frac{1}{3})^ \frac{1}{2} =2^ \frac{1}{6}\)
last choice is correct
