Very large is the answer to this question because the object is at rest. All of the objects that are not moving does not have any momentum because it is not moving. Even if the item is very large, this will not have any effect on the momentum of the item when it is not moving.
There are actually two factors that will affect the momentum of an object. The first one is mass which the object obviously has because it is very large. The second factor is velocity which the object does not have because it is not moving. Based on the details, the fact that this is not moving means that the object cannot have any momentum.