Write a Linear Factorization of the Function $$f ( x ) = x ^ { 4 } + 61 x ^ { 2 } + 900$$

Multiple Choice

Write a linear factorization of the function.
- $$f ( x ) = x ^ { 4 } + 61 x ^ { 2 } + 900$$

A) $f ( x ) = ( x + 30 i ) ^ { 4 }$
B) $f ( x ) = ( x + i ) ( x - i ) ( x + 30 i ) ( x - 30 i )$
C) $f ( x ) = \left( x ^ { 2 } + 30 i \right) \left( x ^ { 2 } - 30 i \right)$
D) $f ( x ) = ( x + 5 i ) ( x - 5 i ) ( x + 6 i ) ( x - 6 i )$