Which of the following statements best describes the Heisenberg uncertainty principle? Select one: O a. The exact position of an electron is always uncertain. O b. None of the given options O c. The velocity of a particle can only be estimated. O d. The location and momentum of a particle can be determined accurately, but not the identity of the particle. e. The location and momentum of a macroscopic object are not known with certainty. Which of the following combinations of quantum numbers is not allowed