Step-by-step explanation:
Two of the requirements that the Berlin Conference imposed on European nations claiming colonies in Africa were:
Actively occupying the territory, as shown by a flag and keeping a police force: European powers were required to establish and maintain a visible presence in the territories they claimed. This meant displaying a flag and maintaining a police force to enforce their control over the territory.
Notifying other European nations when taking possession of African territories: European nations were required to notify other European powers when they took possession of African territories. This was done to prevent conflicts between European powers in Africa and to establish a framework for resolving disputes over territorial claims.