Problem 3: The famous data set iris which gives the measurements in centimeters of the variables sepal length and width and petal length and width, respectively, for 50 flowers from each of 3 species of iris is available in R. Type iris directly to see what it looks like. 1. Selecting the subset whose Species are setosa. 2. Selecting the subset whose Speices are either versicolor or virginica. 3. Selecting the subset whose Sepal.Length are greater than 4.5 but less than 6.0. 4. Combine the data frames you got in part 1 and part 3 to one data frame. 5. Obviously there are some duplicated observations in the data frame you obtained in part 4. Use Punique to learn the usage of the function unique and then utilize it to make the data frame you obtained in part 4 doesn't contain any duplicated observations