A set of 10 new questions in each round. Question: ( 1 of 10 ) If A can do a piece of work in 2 days, B can do the same piece of work in 3 days, while C alone can do the same work in 4 days. Find the number of days to finish the work when they all will work together. (A) 10/12 days (B) 13/12 days (C) 12/13 days (D) 12 days