Please explain numbers 3 and 4 in detail,

I will like it quickly, thank you!

1) Which numbers correspond to the and orbital of H2 respectively? a) 3;2 b) 2;3 c) 1;4 d) 4;1 e) None of the above 2) How many electrons populate the orbital while H2 is in the ground state? (a) 0 b) 1 c) 2 d) 3 e) None of the above 3) What would be the bond order of an H2 molecule in its ground state? a) 0.5 b) 1 c) 1.5 d) 0 e) None of the above 4) What would be the bond order of an H2 molecule in its excited state? a) 2 b) 1.5 c) 1 (a) 0 e) None of the above