The correct examples of checks and balances from the options you provided are:
- The legislative branch can override a veto.
- The judicial branch can rule a new law unconstitutional.
The other options, such as the judicial branch vetoing presidential pardons and the executive branch impeaching a Supreme Court Justice, are incorrect. The executive branch does not have the power to impeach; impeachment is a power of the legislative branch. The executive branch can declare war, but that power is limited and typically requires Congressional approval.