Three factory employees work at constant rates to produce DVDs. Employee A produces y DVDs in 2/5 of an hour. Employee B produces y DVDs in 3/5 of an hour. Employee C produces y DVDs in 5/4 of an hour. Which of the following combinations of employees can produce at least 5y DVDs in 2 hours?

Indicate all such statements.

1. Employee A alone
2. Employee B alone
3. Employee C alone
4. Employees A and B together
5. Employees B and C together
6. Employees A, B, and C together
7. Even if all three employees work together, they will not finish the job