The following line graph shows the production of two products A and B in a company over different years.

Which of the following statement is correct?

I. The production of A and B together in 2016 is 55.

II. The production of A and B together in 2019 is less than the production of A and B together in 2015 by 10.

III. the combined production of A and B is the highest in 2018.