The incentre of triangle formed by the lines $x+y = 1, \; x=1, \;y=1$ is :

Question

( A ) $(1 - \frac{1}{\sqrt{2}}, 1 - \frac{1}{\sqrt{2}})$
( B ) $(\frac{1}{\sqrt{2}}, \frac{1}{\sqrt{2}})$
( C ) $(\frac{1}{\sqrt{2}}, 1-\frac{1}{\sqrt{2}})$
( D ) $(1 - \frac{1}{\sqrt{2}}, 1 - \frac{1}{\sqrt{2}})$