Suppose two coffee snobs who must have their coffee and cream in exact perfect proportions (each cup is 10 black coffee per 1 unit cream) are invited to a weekend long event (during which they can easily consume 8 cups of perfect coffee). Suppose Snob A is given 6 units of cream and 20 units of black coffee. Snob B is given 2 units of cream and 60 units of black coffee.

Select all possible outcomes of an efficient, mutually beneficial trade.

Snob A: 0 perfect coffee

Snob B: 8 perfect coffee

Snob A: 3 perfect coffee

Snob B: 3 perfect coffee

Snob A: 3 perfect coffee

Snob B: 5 perfect coffee

Snob A: 4 perfect coffee

Snob B: 4 perfect coffee