Original Question: A computer server is dependent on a component that is critical to its operation. This component, a module A, has a reliability of 80% (=0.8). To increase the reliability of the server, you are considering adding an extra module A as a backup, which has the same reliability of 80% as the module A. The server functions properly if at least one of the two modules (modules A or A') works properly.

This is a continuation from the previous question. Instead of having one backup module, consider adding many (for example, ten or more) backup modules. Assume there is no correlation among all modules and each backup module has the same reliability of 80%. Which description about the reliability is true?

A

The reliability of the system is beyond 100%.

B

The reliability of the system is exactly 100%.

C

The reliability of the system is less than 100% but is close to 100%.

D

The reliability of the system is exactly 80%.

E

The reliability of the system is less than 80%.

F

No correct answers above