Suppose that for a country, the rate of inflation been constant at 0% for the last 10 years. Which of the following statements is true? 1) Relative prices in this country are not changing, and average prices may be increasing or decreasing. 2) Relative prices in this country may be increasing or decreasingbut average prices not changing. 3) Relative prices in this country may be increasing or decreasing, and average prices may be increasing or decreasing 4) Relative prices in this country are not changingaverage prices are not changing