Question: Suppose C is a class that implements the interfaces I and J according to the diagram below. C c = null; I i = null;

Suppose C is a class that implements the interfaces I and J according to the diagram below.
C c = null;
I i = null;
J j = null;
c = i; // line 1
j = c; // line 2
i = j; // line 3
Given the above variable declarations, which lines below will require a cast?

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