Answer: option a.
Explanation:
Given the expression
, you need to remember:
The Product of powers property:

The Power of a power property:

And:
![\sqrt[n]{a^n}=a](https://img.qammunity.org/2020/formulas/mathematics/middle-school/7n3agtxpmdkpp0ixo9p04d3znbyw20xqj1.png)
Therefore, as the index of the radical is 2, you can rewrite
as:

Rewrite this and simplify. Then:


This matches with the option a.