α(1+β)\frac{\alpha}{(1+\beta)}(1+β)α
1(1+a)\frac{1}{(1+a)}(1+a)1
1(1+β)\frac{1}{(1+\beta)}(1+β)1
β(1+α)\frac{\beta}{(1+\alpha)}(1+α)β
None of them
