Determine the factors of $4 r y+3 r z+8 x y+6 x z$.
a $\quad(4 x+4)(2 y+3 z)$
b $\quad(4 x+3 z)(2 y+r)$
c $\quad(4 y+r)(2 x+3 z)$
d $\quad(4 y+3 z)(2 x+r)$what is the aswer