Which of the following statements is true? a. Countries may have a different growth rate, but they all have the same level of income per person. O b. Countries have great variance in both the level and growth rate of income per person; thus, impoverished countries can become relatively wealthy over time. c. Countries all have the same growth rate and level of output because, due to the internet, every country has access to the same new technologies. d. Countries may have a different level of income per person, but they all grow at the same rate