Can you please help me with this :

1. provide a custom function called irisColor().
   • Your function should take in a single character string as the only input.
   • If the input is "setosa", return "red"
   • If the input is "versicolor", return "lightblue"
   • If the input is "virginica", return "purple"
   • If the input is not one of the above, throw an informative error
2. Use sapply() and your custom function to produce an array of length 150 that has these three colors by species for the 150 specimens in the iris data set.
3. Plot petal width (Y) against petal length (X), using a scatterplot. Make your plot useful by giving it appropriate labels. The main title of the plot should be your name. Additionally, use a solid plotting mark (like pch=20) and color them by species via giving col= your array from b).