The correct answer is options A and C.
When proofreading, one of the most recommended strategies is to keep a dictionary on hand or refer to an online guide, since it will help the proofreader to solve problems related to the use of language in general.
The other useful strategy is to proofread the paper while in the revision state. It is important to state that both strategies can be used at the same time because you consult dictionaries during the revision stage.
