In a distributed computing environment, distributed shared memory is used which is
Logical combination of physical memories on the nodes.
In a distributed system each node has its own local (physical) memory and there is no physically shared memory. Distributed shared memory (DSM) is an abstraction that gives processes on all nodes the illusion of a single shared address space.
The DSM layer builds this space by logically combining the local physical memories of the nodes: data (pages or objects) actually reside in some node's main memory and are fetched or migrated over the network when another node accesses them.
Secondary memories (disks) are not what DSM combines — they are only the backing store — and each node's virtual memory is the result of mapping, not the storage being pooled, so “All of the above” does not hold either.
Hence, the answer is Logical combination of physical memories on the nodes..
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