Determine Which of the Following Is Not True for the Graph

Multiple Choice

Determine which of the following is not true for the graph of $f ( x ) = x ^ { 3 } - x ^ { 2 } - x + 4$

A) ƒ is continuous on $( - \infty , \infty )$
B) ƒ has a relative maximum at x = 1.
C) ƒ has a relative minimum at x = 1.
D) ƒ has a point of inflection at $x = \frac { 1 } { 3 }$
E) ƒ is concave upward on $\left( \frac { 1 } { 3 } , \infty \right)$