Multiply the Monomials $$\left( 6 x ^ { 4 } \right) \left( 7 x ^ { 7 } \right)$$

Multiple Choice

Multiply the monomials. Assume any variable exponents represent whole numbers.
- $$\left( 6 x ^ { 4 } \right) \left( 7 x ^ { 7 } \right)$$

A) $- 42^{ 11}$
B) $42 x^{ 11}$
C) $42 x ^ { 28 }$
D) $- 42 \mathrm { x } ^ { 28 }$