R has a group of built-in datasets for US state data. Run ?state in the R console to see which datasets exist. # Use the built-in state.abb, state.area, and state.regions vectors to create a data frame called st_area_region, which will contain the 50 state abbreviations and their associated areas (square miles) and regions. (For the following, remember to include the R code you used to find the answers.) What is the sum of the 50 state areas in square miles? Use the data in the st_area_region data frame, not in state.area. Which state has the largest area? the smallest area? Use the data in the st_area_region data frame, not in state.area. Generate a plot that shows the number of states in each of the four regions. The x-axis should be labeled "Number of states per region." What are the total areas of each of the four regions?