Which of the following statements about this diagram is true?

(interface I1)
^ extends
(interface I2)
^ implements
[class C]

1) C is a description of what I2 does, not of how it does it
2) C implements the behavior/functionality provided in I1
3) I1 inherits all the methods declared in I2
4) I2 is the implementer view and I1 is the client view
5) none of the above