Answer:
The missing word is <em>backing store.</em>
Explanation:
A backing store is a device for secondary storage of data that typically has greater capacity than the primary store but is slower to access.
A process must be loaded into memory in order to execute.
If there is not enough memory available to keep all running processes in memory at the same time, then some processes who are not currently using the CPU may have their memory swapped out to a fast local disk called the backing store.
The backing store may be the Hard Disk Drive or a Universal Serial Bus Drive. The backing store can sometimes be referred to as <em>virtual memory.</em>
This memory that appears to exist as main storage although most of it is supported by data held in secondary storage, transfer between the two being made automatically as required.
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Answer:
Communication path basically define the path in which the information and messages can be exchange by using the efficient communication path.
There are simple formula for calculating the total number of communication channel that is :

Where, n is the number of stack holder.
Now, the maximum number of communication paths for a team of twenty people can be calculated as:
n=20
=\frac{20(20-1)}{2} = 190
Therefore, 190 is the total number of communication path.
Random Access memory(RAM) stores data temporary until the computer is switched off