Find a Polynomial of Least Degree with Only Real Coefficients $4 + 2 i$

Multiple Choice

Find a polynomial of least degree with only real coefficients and having the given zeros.
- $4 + 2 i$ and $4 - 2 i$

A) $x ^ { 2 } - 8 x + 12$
B) $x ^ { 2 } + 8 x + 20$
C) $x ^ { 2 } - 8 x + 20$
D) $x ^ { 2 } + 20$