Question: Who is the retired Nigerian Army general whom eventually appointed the vice admiral, Ibok-Ete Ekwe Ibas, to Chief of Naval Staff (CNS) of the Nigerian Navy?
Sentence (from "Muhammadu Buhari"): Muhammadu Buhari {'1': ", '2': ", '3': 'GCFR', '4': "} (born 17 December 1942) is the President of Nigeria, in office since 2015.
Relevant evidence: No