What is revision?

a. the step in the writing process where you look at your work critically, asking yourself questions such as, "will my goal be clear to readers? "
b. the step in the writing process when you determine your purpose and audience
c. the step in the writing process when you want to get the format set and put paragraphs in place, with less of a focus on avoiding errors
d. the step in the writing process when you look closely at language mechanics, word usage, and sentence structure