3. case study: read the article, "improving efficiency in a forest pest control spray program" uploaded above and answer the following questions in no more than two pages. a. what is the problem addressed in this paper? b. what is the objective, the decision variables, and the types of constraints in the model. briefly describe. c. if you were to use a modeling language, which would have been the sets and the associated attributes (model parameters and variables)? d. using as guide the "operations research modeling approach" of chapter 2 of the textbook, describe in a few sentences the phases or steps of the modeling approach performed in this particular or project. elaborate on the validation of the model and its use in conducting 'what if' analyses. e. were there any other modeling approaches considered for this project before the linear programming approach was adopted? f. to estimate the model parameters, data were collected or derived. which data were collected by the project investigators, which were derived and which were supplied by which sources? g. if the # of aircraft teams were 5, the # of spray blocks was 500 and the # of airfields were 10, what would have been the size of the model (# of variables and # of constraints). assume that aircraft teams can be stationed at all airfields, can spray all types of insecticides and their operating range is large enough to reach any block from any airport.