Write the Complex Conjugate of the Following Complex Number and Then

Write the complex conjugate of the following complex number and then multiply the number by the complex conjugate. Write the result in standard form.
$1 + \sqrt { - 20 }$

A) $1 - 20 i ; 19$
B) $1 - 5 \sqrt { 2 } i ; 21$
C) $- 1 - 2 \sqrt { 5 } i ; 21$
D) $- 1 - 2 \sqrt { 5 } i ; 19$
E) $1 - 2 \sqrt { 5 } i ; 21$

Correct Answer:

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