The correct answer is Ubiquitous pervasive computing.

Distributed processing normally refers to architectures that split computation and resources across multiple cooperating nodes so tasks are executed in parallel or remotely. Ubiquitous pervasive computing is a broader paradigm about embedding computation into everyday objects and environments to provide seamless, context aware services and human centric experiences. That emphasis on pervasiveness and user context means it is not primarily described as an architectural model for distributing processing across cooperating systems and so it is not considered a form of distributed processing in the same sense as the other options.

Client server model is a classic distributed processing architecture where clients request services from servers and processing and data can be distributed across multiple machines. This model clearly fits the definition of distributed processing.

Peer to peer architecture distributes responsibility and processing among equal nodes that communicate directly so computation and resources are shared across the network. That distribution of work makes it a form of distributed processing.

Service oriented architecture organizes functionality into networked services that can run on different hosts and interact over the network. The use of separate services across multiple systems is a distributed processing approach.

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