If the acceleration of a point mass is given by $\vec{a}=-w^2\vec{r}$, then its trajectory can be

- (A) circle
- (B) ellipse
- (C) hyperbola
- (D) straight line

Enter your answer as a 4 digit string of 1s and 0s - 1 for correct option, 0 for wrong. Eg. 1100 indicates A and B are correct, C and D are incorrect.