Answer:
The correct option is 4.
Explanation:
The given interpretation is square root of the cube root of 6. The mathematical expression is
![\sqrt{\sqrt[3]{6}}](https://img.qammunity.org/2020/formulas/mathematics/college/hpplcx266xl1r72fot55eyhdm9jmg4fkvt.png)
It can be written as

Using the property of exponent, we get
![[\because (x^m)^n=(x)^(mn)]](https://img.qammunity.org/2020/formulas/mathematics/college/x9npnm7laf5vanu4wehyehxfo3p3bx0h63.png)
Now simplify the power.

The simplified form of given expression is 6 to the power of 1 over 6. Therefore the correct option is 4.