A and B together can do a piece of work in 10 days. If A can do the work in 15 days,find in how many days that B alone can do the same work. Given below are the steps involved in solving the above problem. Arrange them in sequential order.

A) One day's work of B is $$\frac{1}{10} - \frac{1}{15}$$

B) One day's work of A and B is $$ \frac{1}{10}$$ and one day's work of A is $$ \frac{1}{15} $$

C) B alone can do the work in 30 days 

D) One day's work of B is $$ \frac{1}{30} $$