$\frac{1\times2\times3\times4\times5}{5\times4\times3\times2\times1}=1$ 
What is the product of five fractions, whose denominators are $5-1$ in descending order, and the numerators are $1-5$ in ascending order？ 

1: $\frac1{25}$ 
2: $\frac1{2}$ 
3: $\frac1{5}$ 
4: $$0$$ 
5: $$1$$ 