"WE THE PEOPLE" Popular sovereignty or the authority of the people referenced in the Preamble of the Constitution - This principle states that government power comes from the consent of the governed (the citizens). One is example of popular sovereignty is the election of representatives and senators in which the citizens hold the vote to elect the legislatures the citizens favor.
Answer:
Well, Your best choice will be is D.
It has a mixed economy. The government protects individual rights, such as minimum pay for work and choices in goods and services. Because, mixed economies often provide environmental protection, maintenance of employment standards, a standardized welfare system, and maintenance of competition.
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An electronic calendar would be an example of software. The remaining things which you've mentioned in your questions would be examples of peripheral devices (so mouse, scanner, and monitor :)).