TOPSHOT - Workers of Independent Nigerian Electoral Commission (INEC) test identity card readers ahead of the country's elections at an INEC office in Umuahia, one of the pro-Biafran separatist regions, on February 13, 2019. - Nigerians are scheduled to cast their ballots on February 16, in presidential and legislative elections. The presidential contest will see incumbent Muhammadu Buhari seek to win a second four-year term against former vice president Atiku Abubakar. (Photo by CRISTINA ALDEHUELA / AFP)