Factor the Polynomial Completely $4 a ^ { 4 } + 25 a ^ { 2 }$

Multiple Choice

Factor the polynomial completely. $4 a ^ { 4 } + 25 a ^ { 2 }$

A) $a ^ { 2 } \left( 4 a ^ { 2 } + 25 \right)$
B) $a ^ { 2 } \left( 4 a ^ { 2 } - 25 \right)$
C) $a \left( 4 a ^ { 3 } + 25 a \right)$
D) $a ^ { 2 } ( 2 a + 5 ) ( 2 a - 5 )$
E) none of these