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Which is correct — roll back or rollback?

Writing For Business

typing Which is correct?
CDP allows the user to _______ to any point in time.
a. roll back
b. rollback

Answer: a. 

Explanation: Roll back is the verb form. Rollback is a noun. Incidentally, the same holds true for log in and login. Also work out and workout. (I know that last one’s not very relative to IT but… it drives me mad!

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