When mehtod X calls method Y, method Y called methhod Z, and method Z calles method X, this is called

A. An error

B. Mutual recursion

C. tail recursion

D. indirect recursion

D. Indirect Recursion.

Explanation:

Indirect recursion is when a method calls other method which calls the original method again.

For example:-

public static int mthd1 (int n)

{

if (n = = 0)

return 0;

else

return (mthd2 (n-1));

}

public static int mthd2 (int n2)

{ return mthd1 (n2-1); }

This is an example of indirect recursion. Where mthd1 calls mthd 2 and mthd 2 calls mthd 1 again.