Question $25($Mandatory$)(2\mathrm{.}22222$ points$)$

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If using a single backup station to increase the reliability for a system of stations, each of which must work in succession for the system to work, it is best to add the backup station $\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_.$ Select the one best answer.

Question $25$ options:

It does not matter to which station the backup is added, they will all lead to the same system reliability

To the station with the lowest initial reliability

To the first station

To the last station

All of the above

None of the above