The acceleration of a particle as seen from two frames  $S_1\&S_2$ have equal magnitude of $3m\text{/}{s}^2$ . Then

The frames must be at rest with respect to each other

The acceleration  $S_2$ with respect to $S_1$  can be zero

The acceleration  $S_2$ with respect to $S_1$  can be  $2m\text{/}{s}^2$

The acceleration $S_2$  with respect to $S_1$  can be  $3m\text{/}{s}^2$