The following is an isotope of lithium-7. Please select the correct answer regarding the atom of this isotope. ⁷₃ Li a. There are 3 protons and 4 neutrons located in the nucleus of this atom. There are 3 electrons located in the energy levels surrounding the nucleus. b. There are 7 protons and 3 neutrons located in the nucleus of this atom. There are 3 electrons located in the energy levels. c. There are 3 protons and 7 neutrons located in the nucleus of this atom. There are 7 electrons located in the energy levels surrounding the nucleus. d. None of the answers are correct.