USOC wiring schemes are used only for voice communication applications. The correct option is d.
The USOC is essentially a naming convention for registered jack (RJ) wiring configurations that are still in use in telephone jacks or connectors today.
The most basic example is the RJ-11 jack, which comes in a variety of configurations and is used to connect telephones to the network interface.
A Voice application is a piece of software that enables you to make VoIP calls over a network connection when installed on your multimedia-enabled PC, Smartphone, or Tablet. Only voice communication applications use USOC wiring schemes.
Thus, the correct option is d.
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