The minister of education in the country of Zanara is concerned that girls are much less likely than boys to attend high school. They want to offer a conditional cash transfer of $100 to parents if their daughter completes the first year of high school between ages 14 and 16. The main outcome would then be the enrollment rate for girls (i.e. the percent of girls of between ages 14 and 16 that are enrolled in the first year of high school). Part 1. First, the deputy minister suggests an approach to evaluating the impact of the program. He suggests you compare the enrollment rate for girls during the first year of the program to the enrollment rate for girls in the year before the program began. a) What is this type of impact evaluation called? Is this a valid approach to impact evaluation? Why or why not? Explain with specific reference to this setting