2D Array Shallow Copy with Clone

Question

What does the above program print and why?
 
```java
public class ArrayCopy {
    public static void changeArray(int[][] arr) {
        int[][] copy = arr.clone();  // Shallow copy
        copy[0][0] = 100;
    }
    public static void main(String[] args) {
        int[][] data = { {1, 2}, {3, 4} };
        changeArray(data);
        System.out.println(data[0][0]);
    }
}
```

Accepted Answer

100, because arr.clone() creates a shallow copy that still shares inner arrays with the original.

Answer

0, because the array elements are reinitialized to 0.

Answer

1, because arr.clone() creates a deep copy, leaving the original array unchanged.

Answer

A compilation error occurs due to improper cloning of a 2D array.

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