There are two different configurable products which both share one variation. The shared variation is represented by the same simple product. A customer added both configurable to the cart with the same selected variation?
A. As two separate line items with quantity 1 each
B. As one line item which lists both configurable products with quantity 1 each
C. As one line item of the first product with quantity 2
D. As one line item of the second product with quantity 2