Solve the Inequality $x ^ { 2 } - 4 x + 1 \leq 0$

Multiple Choice

Solve the inequality. Express your answer in interval form. $x ^ { 2 } - 4 x + 1 \leq 0$

A) $( 2,2 + \sqrt { 3 } ]$
B) $( - \infty , 2 - \sqrt { 3 } ] \cup [ 2 + \sqrt { 3 } , \infty )$
C) $[ 2 - \sqrt { 3 } , 2 + \sqrt { 3 } ]$
D) $( 0,2 - \sqrt { 3 } ] \cup [ 2 + \sqrt { 3 } , 0 )$
E) no solution