Find the Largest Open Interval Where the Function Is Changing $f ( x ) = x ^ { 2 } - 2 x + 1$

Multiple Choice

Find the largest open interval where the function is changing as requested.
-Increasing $f ( x ) = x ^ { 2 } - 2 x + 1$

A) $( - \infty , 1 )$
B) $( 1 , \infty )$
C) $( 0 , \infty )$
D) $( - \infty , 0 )$