which is the best option when combining workloads that span more than one rail?

On the SL8500, which is the best option when combining workloads that span more than one rail?

A.
using the middle two rails for active enters and ejects

B.
using rails that are adjacent to each other within the same SL8500

C.
using the top rail for extra archival space and any other rail for active data

D.
using the top rail for active enters and ejects and any other rail for archival space

Explanation:
If you are not able to assign workloads to a single rail, consider:
* Using rails that are adjacent to each other. This provides a shorter distance for
the pass-thru operation.
* Combining rails vertically rather than horizontally
StorageTek SL8500 Modular Library System, Best Practises, Dedicating Rails