Write the Expression in the Form $a + b i$ , Where a and B Are Real Numbers

Write the expression in the form $a + b i$ , where a and b are real numbers. $( 4 - 2 i ) ^ { 2 }$

A) $20 + 0 i$
B) $12 - 16 i$
C) $12 - 8 i$
D) $20 - 8 i$
E) $20 - 16 i$