Which of the Following Functions Are the Constant Solutions of the Equation

Multiple Choice

Which of the following functions are the constant solutions of the equation
$$\frac { d y } { d t } = y ^ { 4 } - y ^ { 3 } + 6 y ^ { 2 }$$

A) $y ( t ) = 2$
B) $y ( t ) = 3$
C) $y ( t ) = 5$
D) $y ( t ) = 0$
E) $y ( t ) = e ^ { t }$