What will be the result of attempting to run the following program？（）   public class Qaa75 {   public static void main（String args[]） {   String[][][] arr = {   { {}， null }，   { { "1"， "2" }， { "1"， null， "3" } }，   {}，   { { "1"， null } }  }；   System.out.println（arr.length + arr[1][2].length）；   }   }