Which of the following are the correct ways to define an array of 2 rows and 3 columns? 1 int a; a = new int{{7, 1, 3},{2, 9, 6}}; 2 int a; a = new int{}; 3 int a = {{7, 1, 3}, {2, 9,6 }}; 4 int a; a = new in

Which of the following are the correct ways to define an array of 2 rows and 3 columns?

1 int[ , ] a;
a = new int[2, 3]{{7, 1, 3},{2, 9, 6}};

2 int[ , ] a;
a = new int[2, 3]{};

3 int[ , ] a = {{7, 1, 3}, {2, 9,6 }};

4 int[ , ] a;
a = new int[1, 2];

5 int[ , ] a;
a = new int[1, 2]{{7, 1, 3}, {2, 9, 6}};