"what kinds of friends" or "what kind of friends"?

Which of the following is/are correct? Or each one has a different meaning/use? Thanks.

"what kinds of friends" or "what kind of friend"?
"what kinds of friend" or "what kind of friends"?

1 and 2 are common.
1) What kinds of friends do you have? Several. Those who play music, those who play poker, ....
2) What kind of friend is that?
Ah! A very close friend.
I don't think that there are correct uses of 3 or 4.