Which choice gives the correct context for Delaware GDP per capita?

• A valid Delaware GDP-per-capita calculation requires GDP and population data from one current figure and one undated estimate
• A valid Delaware GDP-per-capita calculation requires GDP and population data from unrelated reference periods
• A valid Delaware GDP-per-capita calculation requires GDP and population data from compatible reference periods
• A valid Delaware GDP-per-capita calculation requires GDP and population data from different decades without adjustment