Perform the Division of the Polynomials by Monomials $\frac { 24 z ^ { 9 } + 42 z ^ { 12 } } { 6 z ^ { 4 } }$

Multiple Choice

Perform the division of the polynomials by monomials. $\frac { 24 z ^ { 9 } + 42 z ^ { 12 } } { 6 z ^ { 4 } }$

A) $4 z ^ { 13 } + 7 z ^ { 8 }$
B) $4 z ^ { 5 } + 7 z ^ { 8 }$
C) $4 z ^ { 5 } + 168 z ^ { 8 }$