Stone would have to be carried and built up into walls, then the sails would have to be made and after that there would be need for dynamos and cables. (How these were to be procured, Snowball did not say.) In this excerpt from Animal Farm, study the context in which the words dynamo and procured are used. Without being familiar with the meaning of this word, what could one best discern about a dynamo?

It lasts a long time.
It is very expensive.
It is difficult to obtain.
It generates electricity.