If Possible, Factor the Polynomial Completely $$36 \mathrm { k } ^ { 3 } \mathrm {~m} - 84 \mathrm { k } ^ { 2 } \mathrm {~m} ^ { 2 } + 49 \mathrm {~km} ^ { 3 }$$

Multiple Choice

If possible, factor the polynomial completely. If a polynomial cannot be factored, state that it is prime.
- $$36 \mathrm { k } ^ { 3 } \mathrm {~m} - 84 \mathrm { k } ^ { 2 } \mathrm {~m} ^ { 2 } + 49 \mathrm {~km} ^ { 3 }$$

A) $\mathrm { km } ( 6 \mathrm { k } + 7 \mathrm {~m} ) ^ { 2 }$
B) $k m ( 6 k - 7 m ) ( 6 k + 7 m )$
C) $\left( 36 \mathrm { mk } ^ { 2 } + \mathrm { km } \right) \left( \mathrm { k } + 49 \mathrm {~m} ^ { 2 } \right)$
D) $\mathrm { km } ( 6 \mathrm { k } - 7 \mathrm {~m} ) ^ { 2 }$