Answer:
Second option x 
Explanation:
We have the function 

We know that the square root of a negative number has no solution in the real ones. Therefore the domain of this function is 

When applying the transformation: 
 we have a translation of the original function in 7 units to the right and 2 units to the top: 

In the same way we must guarantee that 

Then 
. 
Therefore the domain of f(x) is x