Consider the following recursive method: public static int Fun(int x){ if(x == 0) //line 1 return 0 //line 2 else if( x == 1) //line 3 return 1; //line 4 else //line 5 return (x*Fun(x-1)); //line 5 } 1) Is Fun(4) a valid call? If so, what is the value? If not, explain why? 2) Is Fun(-4) is a valid call? If so, what is the value? If not, explain why?

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A: According to the Question below the Solution:   Output: