Where to apply for a national visa?

My place of residence My visa application should be submitted to
Congo (Democratic Republic)  Embassy of Switzerland in Kinshasa 
Congo (Brazzaville)   Embassy of Switzerland in Kinshasa  
Gabon General Consulate of Switzerland in Libreville / For marriage preparation: Embassy of Switzerland in Kinshasa
Sao Tomé and Principe Consulate of Switzerland in Sao Tomé / For marriage preparation: Embassy of Switzerland in Kinshasa