I am unsure of whether to use singular or plural describing a list where the objects in the list are choices

Which is correct:

Three different strategies whereby X and Y are produced in a ratio of 1:2, 1:1, or 2:1.

or

Three different strategies whereby X and Y are produced in ratios of 1:2, 1:1, or 2:1.

To me they mean different things:

Three different strategies whereby X and Y are produced in a ratio of 1:2, 1:1, or 2:1.

X and Y are separate products made of A and B. The ratio refers to the A:B relationship.

Three different strategies whereby X and Y are produced in ratios of 1:2, 1:1, or 2:1.

X and Y are the components of a single product. “Ratios” refers to the X:Y relationship.

Here is another phrasing that may be closer to the intended meaning:  

Three different strategies whereby X and Y are produced in a ratio of either 1:2, 1:1, or 2:1.

X and Y are separate products that occur or are produced as a result of the variables of a system.