Find the Exact Value of the Expression $\cot \theta = 1$

Multiple Choice

Find the exact value of the expression.
- $\cot \theta = 1$

A) $225 ^ { \circ }$ and $315 ^ { \circ }$
B) $45 ^ { \circ }$ and $315 ^ { \circ }$
C) $45 ^ { \circ }$ and $225 ^ { \circ }$
D) $135 ^ { \circ }$ and $225 ^ { \circ }$