2. The idcourse. txt data contains two columns of character variables: 1. ID and 2. Course a). Use an infile statement to read in the dataset b). Create a new variable PSTAT which is an indicator variable for the course being a PSTAT course, i. e. it equals to 1 when the first 5 letters of the course are PSTAT and 0 Otherwise c). Create a new SAS dataset which outputs the ids of students where the course is a PSTAT course, i. e. when the variable created in the previous part is equal to 1