QUESTION 3 This code from the Polling case study polls['gap'] = polls.clinton_pct - polls.trump_pct polls['state_gap'] = polls.groupby('state').gap.transform(func='mean') polls['swing'] = (polls.state != "U.S.") \& (abs(polls.state_gap) "2016-09"'), kind="line", x= 'enddate', y= 'gap', ci=None, col='state', col_wrap=2) creates a line plot for two states that a. shows how the gap between the Clinton and Trump percents changed over time b. displays one subplot for each state that shows how the Clinton and Trump percents changed over time c. shows how the Clinton and Trump percents changed over time d. displays one subplot for each state that shows how the gap between the Clinton and Trump percents changed over time