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 $f ( x ) = x ^ { \frac { 4 } { 3 } } + 4 x ^ { \frac { 1 } { 3 } } + 2$

A) ƒ is continuous on $( - \infty , \infty )$
B) ƒ has no relative maximum.
C) ƒ has a relative minimum at x = -1.
D) ƒ has a point of inflection at x = 2.
E) ƒ is concave downward on $( - \infty , 0 )$