The following sentence has been provided by the Grammar Police for your examination:
A, B, C, and D are all correct answers, but E, F, and G are not.
What is the correct usage of the Oxford comma in this sentence?
Answer 1: The sentence is missing an Oxford comma.
Answer 2: The sentence is using too many Oxford commas.
Answer 3: The sentence is using an Oxford comma in a sentence that doesn't need it.