$3$:$10$ AM Tue $13$ Feb

$1-DS$

Question $3$

Which of the following describe matrix variable $($defined in line $1)$:

int $[][]$ matrix $=\{\{7,8,9\},\{4,5,6\},\{1,2,3\}\}$;

int row $=$ matrix.length;

for $($int $i=0$;$i$ row; $i++)1$

for $($int $j=i$;$j$ row; $j++)1$

int temp $=$matrix$[i][j]$;

matrix$[i][j]=$matrix$[j][i]$;

matrix$[$j$][$i$]=$ temp;

$\}$

$\}$

for $($int $i=0$;$i$ matrix.length; $i++($

System.out.print $($matrix$[$i$][$j$]+",")$;

$\}$

System.out.print $("")$;

$\}$

matrix is a reference variable for a two dimensional array that has $3$ rows and $3$ columns

matrix is a reference variable for a one dimensional array with $3$ elements

matrix is a primitive integer type

matrix is a reference variable for a two dimensional array that has $3$ rows and no columns