Answer:
c. It refers to a situation in which a product's usefulness increases with the number of people using it.
Explanation:
Network externalities also called demand-side economies of scale refers to the increasing utility that a user derives from the consumption of a product such that as the number of people who consume the product increases.
This phenomenon can also lead to a situation known as natural monopoly.
Answer:
it's number 3 if I remember for Microsoft Excel
Explanation:
click “File” from the menu in the top left-hand corner of Excel. Then click “Save As
