Recursive Method Return Value

Question

Which of the following could be used to replace /* missing code*/ so that the value of mystery(10) is 32?
 
Consider the following incomplete method:
```
public int mystery(int x)
{
   if (x <= 1) {
      return 1; 
   } else {
      return ( /* missing code*/ ); 
   }
}
```
Which of the following could be used to replace `/* missing code*/` so that the value of `mystery(10)` is 32?

Accepted Answer

2 * mystery(x – 2)

Answer

4 + mystery(x – 1)

Answer

4 * mystery(x – 4)

Answer

2 * mystery(x – 1)

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