The type of computer network that enables the two researchers to interact with each other and store documents on a central server is a Wide Area Network (WAN).
A WAN is a network that covers a large geographical area, such as across different cities or even countries. It allows multiple devices, like computers, to connect and communicate with each other over long distances. In this case, the two researchers can access, edit, and share research documents by connecting their computers to the WAN.
To enable this interaction, the researchers would need an internet connection, as WANs are typically built using the internet infrastructure. They can access the central server, which is located in a data center or a remote location, by connecting to it through the internet. This central server acts as a storage location for the research documents, allowing both researchers to access and edit them from their respective locations.
By using a WAN, the researchers can collaborate effectively despite being in different cities. They can work on the same documents, make changes, and share the updated versions with each other. This type of network enables remote collaboration and makes it easier for the researchers to work together on their project.