The follow command is entered in MATLAB:

$x3=[0,1,0,1,0]$;

$c6=[1,1,1]$;

$M=[4$;$-2$;$-4$;$1,2,3,4,5$;$r3]$;

$M=[M,c6]$

a$.$ Determine the resulting matrix $M_{{?}_{?}}$

b$.$ Give the matlab command to store the second row of $M$ in the $r2$

c$.$ Give the command that will compute the number of rows and columns in M$.$ Store the results as $nr$ and $nc.$

d$.$ Give the command that will compute the dot product of the first and third row of $M_{?}$