Factor by Any Method $$a ^ { 6 } + 1$$

Multiple Choice

Factor by any method.
- $$a ^ { 6 } + 1$$

A) $( a + 1 ) ( a - 1 ) \left( a ^ { 2 } + a + 1 \right) \left( a ^ { 2 } - a + 1 \right)$
B) $\left( \mathrm { a } ^ { 3 } + 1 \right) \left( \mathrm { a } ^ { 3 } - 1 \right)$
C) $\left( a ^ { 2 } + 1 \right) \left( a ^ { 4 } - a ^ { 2 } + 1 \right)$
D) $( a + 1 ) ( a - 1 ) \left( a ^ { 4 } - a ^ { 2 } + 1 \right)$