What was the most notable contribution of windows 3.11?

Wireless communications is likely to be viewed as an essential part of an enterprise network infrastructure when: select one: a. mobile communication is needed b. communication facilities must be installed at low initial cost c. communication must take place in a hostile or difficult terrain that makes wired communication difficult or impossible d. the same information must be broadcast to many locations

Under which key category do the page up and page down keys fall? page up and page down keys fall under the keys category.

Which of these is most responsible for differences between the twentieth century to the twenty-first century?