Answer:
The represented function is :

Explanation:

And the equation must pass through (2,1) as given,
But, f(2) = 2.0625 ≠ 1 so this is not the required function.

And the equation must pass through (2,1) as given,
But, f(2) = 0.0039 ≠ 1 so this is not the required function.

And the equation must pass through (2,1) as given,
But, f(2) = -1.94 ≠ 1 so this is not the required function.

And the equation must pass through (2,1) as given,
We see, f(2) = 1 so this is the required function and the corresponding graph of the function is attached below :
Hence, The correct option is (4)