In a shell model description, neglecting Coulomb effects, which of the following statements for the energy and spin parity is correct for the first excited state of A = 12 isobars \({ }_5^{12} \mathrm{~B}\), \({ }_6^{12} \mathrm{C}\), \({ }_7^{12} \mathrm{~N}\)?
1
same for \({ }_5^{12} \mathrm{~B}\), \({ }_6^{12} \mathrm{C}\) and \({ }_7^{12} \mathrm{~N}\)
2
different for each \({ }_5^{12} \mathrm{~B}\), \({ }_6^{12} \mathrm{C}\) and \({ }_7^{12} \mathrm{~N}\)
3
same for \({ }_5^{12} \mathrm{~C}\) and \({ }_7^{12} \mathrm{~N}\), but different for \({ }_6^{12} \mathrm{B}\)
4
same for \({ }_5^{12} \mathrm{~B}\) and \({ }_7^{12} \mathrm{~N}\), but different for \({ }_6^{12} \mathrm{C}\)