1. For each of the following examples, determine the data type, namely, whether the data is cross-section, time-series, pooled cross sections or panel data. (Explain why) (a) Data on the share of the US population fully vaccinated and partially vaccinated against COVID-19 from March 1 to September 3, 2021. (b) Data on the closing prices for each of the S&P 500 companies on July 2, 2021. (c) Data on the birth rate, death rate, and population growth rate in OECD countries over a 10-year period. (d) Data on the unemployment rate and inflation rate in California from 2005:Q1 to 2020:Q4. (e) Data on the county government's expenditures on public safety, transportation, and human services for all 67 counties in Florida from Fiscal Years 2006 through 2019