Which of the following sentences is punctuated correctly?

Question

Quizplus · Accepted Answer

Would you like milk in your coffee? uses the correct punctuation. Since this sentence is a question, it requires a question mark as the ending punctuation.
Would you like milk in your coffee. does not use correct punctuation. This sentence is a question, so it requires a question mark, not a period.
Would you like milk in your coffee?. does not use correct punctuation. All sentences should only ever have one type of ending punctuation. In this case it should be a question mark because the sentence is a question.
Would you like milk in your coffee.? does not use correct punctuation. All sentences should only ever have one type of ending punctuation. In this case it should be a question mark because the sentence is a question.

Which of the Following Sentences Is Punctuated Correctly