A \( 2 \, \text{kg} \) brick begins to slide over a surface which is inclined at an angle of \( 45^\circ \) with respect to horizontal axis. The co-efficient of static friction between their surfaces is:
\( 1.7 \)
\( 0.5 \)
\( 1 \)
\( \dfrac{1}{\sqrt{3}} \)