$[]($a$)$ Create a vector A consisting of the elements of the third column of M and a vector Wconsisting of the elements of the second row of M$.($b$)$ Create a $4\backslash$times $3$ matrix B consisting of all elements of the second through fourth columns of M$.($c$)$ Create a $3\backslash$times $4$ matrix C consisting of all elements in the first through third rows of M$.($d$)$ Create a $2\backslash$times $3$ matrix D consisting of all elements of the second and third rows and last three columns of M$.$Problem $6.(1$