SUMIFS to total product A and B

Guten Tag!

I have attached a spreadsheet. I have 4 products - A, B, C, and D, along with how many units of them were made.
I have no problem automatically summing up "units made" for each individual product, however, I AM having trouble using SUMIFS to sum "units made" for both A and B in the same cell.

=SUMIFS(units made column,product type column, can be A or B)

Any ideas would be appreciated.