Which of these terms describes phase I of the history of modern computing?

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RAT: Phase I of the history of modern computing is called the mainframe era in which many people shared one computer.Phase II in modern computing is the PC era which is characterized by one person to one computer.Phase III is the era of ubiquitous computing (UC),in which there will be many computers to each person.This era will result in calm technology in which computers do not cause stress and anxiety for the user.

Which of These Terms Describes Phase I of the History