In simple words, Understanding can be understood as a psychological mechanism in which one is prepared to learn about through use ideas to interact effectively with a conceptual or tangible entity, as in an individual, circumstance, or letter. Understanding is just a relationship between the learner and the understood object.
Thus, from the above we can conclude that the correct option is understanding.
if it is the best shape possible it is not a brainstorm and you can assume they have edited it. between revising or publishing. but they have written a draft so revising.
