Over the years, UNICEF has supported countries in collecting data related to children and women through an international household survey program. The survey responses on sanitation and hygiene from 70 countries in 2015 are constructed into a dataset on handwashing. You can download the CSV file from OA 4.3. Use the dataset to answer the following questions using UNIX commands or utilities:

a. Which region has the lowest percentage of urban population?

b. List the region(s) where the number of urban population in thousands are more than a million and yet they comprise less than half of the population.