Where is the Headquarters of GAVI, officially Gavi, the Vaccine Alliance is a public–private global health partnership with the goal of increasing access to immunization in poor countries?

Where is the Headquarters of GAVI, officially Gavi, the Vaccine Alliance is a public–private global health partnership with the goal of increasing access to immunization in poor countries?

A. Vienna
B. Geneva
C. New York
D. Nairobi