Factor the Polynomial Completely $7 z ^ { 6 } + 7 z ^ { 7 } + 7 z ^ { 4 }$

Multiple Choice

Factor the polynomial completely. $7 z ^ { 6 } + 7 z ^ { 7 } + 7 z ^ { 4 }$

A) $7 z ^ { 4 } \left( z ^ { 2 } + z ^ { 3 } + z \right)$
B) $7 z ^ { 4 } \left( z ^ { 2 } + z ^ { 3 } + 7 \right)$
C) $7 z ^ { 4 } \left( z ^ { 2 } + z ^ { 3 } + 1 \right)$