When the net force acting on an object is zero, the object is either at rest or moving at a constant velocity. Therefore, the correct statement in the multiple-choice options provided is:
The object is at rest.
It is also true that if the object is already moving, it will maintain that constant velocity (not speeding up, slowing down, or changing direction). However, since "the object is at rest" is explicitly one of your options, it is the most accurate response given.