Dynamic 2D Array Creation

Question

Which of the following is an example of creating a 2D array with dimensions provided as arguments?
```java
public class MatrixCreator {
    public static int[][] createMatrix(int rows, int cols) {
        return new int[rows][cols];
    }
    public static void main(String[] args) {
        int[][] matrix = createMatrix(3, 4);
        System.out.println(matrix.length + "x" + matrix[0].length);
    }
}
```

Accepted Answer

```java
public class MatrixCreator {
    public static int[][] createMatrix(int rows, int cols) {
        return new int[rows][cols];
    }
    public static void main(String[] args) {
        int[][] matrix = createMatrix(3, 4);
        System.out.println(matrix.length + "x" + matrix[0].length);
    }
}
```

Answer

```java
public class MatrixCreator {
    public static int[][] createMatrix(int rows, int cols) {
        return null;
    }
    public static void main(String[] args) {
        int[][] matrix = createMatrix(3, 4);
        System.out.println(matrix.length + "x" + matrix[0].length);
    }
}
```

Answer

```java
public class MatrixCreator {
    public static int[][] createMatrix(int rows, int cols) {
        return new int[rows-1][cols-1];
    }
    public static void main(String[] args) {
        int[][] matrix = createMatrix(3, 4);
        System.out.println(matrix.length + "x" + matrix[0].length);
    }
}
```

Answer

```java
public class MatrixCreator {
    public static int[][] createMatrix(int rows, int cols) {
        int[][] matrix = new int[rows][cols];
        return matrix;
    }
    public static void main(String[] args) {
        int[][] matrix = createMatrix(3, 4);
        System.out.println(matrix.length + "x" + matrix[0].length);
    }
}
```

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