Which of the Following Guidelines Should Be Followed While Editing

Which of the following guidelines should be followed while editing a document?

A) The editing process should always be followed by revision of the document.
B) The proofreading process should be undertaken before the revision process.
C) Acknowledgements should be made when information is external to an organization.
D) A spell-check instead of proofreading manually is more efficient to identify errors.
E) It is important to proofreading one's own document instead of swapping it with another.