I would say A or D im leaning towards A more though.
Answer:
Swapping two numbers means exchange the values of two variables with each other.
Mixed and market economies protect individuals' ability to make their own economic decisions.
ARPANET was the network that became the 'basis' for the Internet. It was based on a concept first published in 1967. It was developed under the direction of the U.S. Advanced Research Projects Agency (ARPA). In 1969, the idea became a modest reality with the interconnection of four university computers.
