Jared enjoys using Gaussian elimination to evaluate the determinant of a matrix and their latest challenge is the following matrix.

Let A $=$

$2$p $+9$

p$-3$

P$-3$

P$-3,$

where pER.

Jared performs the following operations using Matlab:

A $=[[$p$,$ p$.$ p$-3]$: $[1,2*$p $+9,$ p$-3]$: $[-8,$ p$.$ p$-3)1$;

B $=$ A;

B$3=1/$p$-3$A$3$

$2$p $+9$

$-8$

C $=$ B:

C$($:$,2)=$ B$($:$,2)-$ p$*$B $($:$,3)$

c $=$

$1$

p$+9$

$-8$

$($a$)$ Is the Matlab output a result of column operations or row operations?