Write the Binomial Expansion of the Expression $$( 3 x + 1 ) ^ { 4 }$$

Multiple Choice

Write the binomial expansion of the expression.
- $$( 3 x + 1 ) ^ { 4 }$$

A) $\left( 9 x ^ { 2 } + 3 x + 1 \right) ^ { 4 }$
B) $81 x ^ { 4 } + 108 x ^ { 3 } + 54 x ^ { 2 } + 12 x + 1$
C) $81 x ^ { 4 } + 108 x ^ { 3 } + 54 x ^ { 2 } + 12 x + 2$
D) $81 x ^ { 3 } + 108 x ^ { 2 } + 54 x + 12$