The reason why it wouldn't be practical for big corporations to build a network with only one (1) transmission medium is: C. because they require a combination of transmission media types to function properly.
A big corporation can be defined as a corporate organization that has facilities and owns (controls) assets that are used for the manufacturing of goods and services in at least one (1) country, other than its headquarter (home office) located in its home country.
This ultimately implies that, a big corporation is a corporate organization that owns (controls) its business operations in two or more countries.
In light of the above, a big corporation require a combination of multiple transmission medium or transmission media types such as the following, in order for them to function properly, effectively, and efficiently:
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Generation in computer terminology is a change in technology a computer is/was being used. Initially, the generation term was used to distinguish between varying hardware technologies. Nowadays, generation includes both hardware and software, which together make up an entire computer system.
Generation & Description
1 First Generation
The period of first generation: 1946-1959. Vacuum tube based.
2 Second Generation
The period of second generation: 1959-1965. Transistor based.
3 Third Generation
The period of third generation: 1965-1971. Integrated Circuit based.
4 Fourth Generation
The period of fourth generation: 1971-1980. VLSI microprocessor based.
5 Fifth Generation
The period of fifth generation: 1980-onwards. ULSI microprocessor based.