Identify Any Points at Which the Folium of Descartes $x = \frac { 8 t } { 1 + t ^ { 3 } } , y = \frac { 8 t ^ { 2 } } { 1 + t ^ { 3 } } \text { is not }$

Multiple Choice

Identify any points at which the Folium of Descartes $x = \frac { 8 t } { 1 + t ^ { 3 } } , y = \frac { 8 t ^ { 2 } } { 1 + t ^ { 3 } } \text { is not }$ smooth. Round your answer to two decimal places, if necessary.

A) not smooth when $t = - 1.00$
B) not smooth when $t = 0$
C) not smooth when $t = 2.67 , - 2.67$
D) smooth everywhere
E) not smooth when $t = 2.67$