When Using CSS to format output, which of the following is/ are true ?

Question

When Using CSS to format output, which of the following is/ are true ? a. Styles can be applied to all elements having the same CSS Class attribute b. Styles can be applied to specific elements based on their ID attribute c. Styles can be applied to elements based on their position in a hierarchy d. Style can be used to invoke script based code e. All of the above.