The correct answer is option 3. Members of the Union Public Service Commission can be removed by the President on the basis of an inquiry and report by the Supreme Court.

Let`s break down the other options for better understanding:

- Option 1: Members cannot be removed by Parliament through a resolution adopted with a 2/3rd majority. This process does not have the power to remove the members of the UPSC.

- Option 2: The President cannot remove the members based on a unanimous recommendation from the Union Council of Ministers. This process does not have the authority to remove UPSC members.

- Option 4: The President cannot remove the members of UPSC on the recommendation from the Central Administrative Tribunal. The CAT does not have the power to remove UPSC members.

Therefore, option 3 is the correct answer.