I heard the question "Who is it?" in a movie.
[Person A] knocked on a door.
[Person B] came to open the door, but before that he asks "Who is it?"
This three syllables question can be pronounced three different ways with different stress patterns. Here's my try (1st: DA-da-da; 2nd: da-DA-da; 3rd: da-da-DA): https://dl.dropboxusercontent.com/u/1924024/whoisit.wav
Even hearing it in a movie I'm still not sure which version is correct in a context like I mentioned above (at a door). Should I stress the word "Who" and let the other two words have a falling intonation? or should I stress the word "is" more?