$\text { Find a polar equation in the form } r \cos \left( \theta - \theta _ { 0 } \right) = r _ { 0 } \text { for the given line. }$

Multiple Choice

$\text { Find a polar equation in the form } r \cos \left( \theta - \theta _ { 0 } \right) = r _ { 0 } \text { for the given line. }$
-x = -4

A) $r \cos ( \theta + \pi ) = 4$
B) $\mathrm { r } \cos \left( \theta - \frac { \pi } { 2 } \right) = 4$
C) $r \cos \theta = 4$
D) $r \cos \left( \theta + \frac { \pi } { 2 } \right) = 4$