For the Given Function, Find All Critical Numbers $y = x ^ { 3 } - 3 x ^ { 2 } - 105 x + 5$

Multiple Choice

For the given function, find all critical numbers. $y = x ^ { 3 } - 3 x ^ { 2 } - 105 x + 5$

A) $x = 0$
B) $x = - 7$ and $x = - 5$
C) $x = - 7$ and $x = 5$
D) $x = - 5$ and $x = 7$
E) $x = 5$ and $x = 7$