The server that would a client/server network include to allow users to share software is option D: communications server.
Open, standards-based computing platforms known as communications servers serve as a carrier-grade common platform for a variety of communications applications and let equipment manufacturers add value at various levels of the system architecture.
Therefore, When constructing the network infrastructure needed to deploy communication systems like wireless, broadband, or IP-multimedia, equipment manufacturers or suppliers start with a communications server as their base. Communications servers have a lot of support from the IT and communications sectors.
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