Write the Word or Phrase That Best Completes Each Statement $\sqrt { x ^ { 2 } + 6 x + 16 } = 4$

Multiple Choice

Write the word or phrase that best completes each statement or answers the question.
Provide an appropriate response.
- $\sqrt { x ^ { 2 } + 6 x + 16 } = 4$

A) $\{ - 6 \}$
B) $\{ - 6,6 \}$
C) $\{ 0 , - 6 \}$
D) $\varnothing$