Identify the comma rule that the following sentence breaks:
 In their homeroom classes, students learned of a new very strict rule that would affect their parking privileges. (5 points)
 Use a comma to separate three or more items in a series.
 Use a comma to set off a phrase or clause at the beginning of a sentence.
 Use a comma to separate coordinate adjectives.
 Use a comma to set off a parenthetical element in the sentence.