What is the number of unpaired electron(s) in the highest occupied molecular orbital of the following species: N$$_2$$, N$$_2^+$$, O$$_2$$, O$$_2^+$$?

A

0, 1, 2, 1

B

2, 1, 2, 1

C

0, 1, 0, 1

D

2, 1, 0, 1