What was the tenure of the only Acting Secretary General of the UN, Gladwyn Jebb?

A. 24 Sep, 1945 to 1 Feb, 1946
B. 24 Nov, 1956 to 10 Feb, 1945
CC. 10 Feb, 1946 to 24 Oct, 1946
D. 24 Oct, 1945 to 1 Feb, 1946

Submitted by: Saeed Ahmed