A combination of one or more columns used to identify particular rows in a relation is a ________

Electronic shopping is a type of ________

A) direct selling B) network marketing C) multilevel selling D) corporate selling E) direct marketing

Public-sector procurement policies are common in Country X. Which of the following is the most likely characteristic of Country X?

A) extensive state ownership of industry B) highly educated labor force C) numerous small firms D) minimal tariffs