The first phone was made in 1854 by <span>Antonio Meucci.
Other inventors like </span>Johann Philipp Reis, <span>Alexander Graham Bell, Elisha Gray, and Thomas Edison reinvented the telephone or enhanced it.</span>
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Windows OS and Mac OS are examples of single user, multi tasking Operating Systems.
Answer:
CPU register) is one of a small set of data holding places that are part of the computer processor. A register may hold an instruction, a storage address, or any kind of data (such as a bit sequence or individual characters). Some instructions specify registers as part of the instruction.