Computer Basic Information
In synchronous transmission data from various users

Sometimes require header
Do not require header
None of these
All of these
Require header

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Computer Basic Information
The real business and competitive value of information technology lies in:

The capabilities of software and the value of the information a business acquires and used.
The infrastructure of hardware, networks, and other it facilities that are commonly used by many companies.
The capabilities of the hardware and the speed at which it processes information.
The software application that are used by many companies.

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