Rings and Saddles are types of packing used in towers. Which option lists them as a correct choice?

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Rings and saddles are classic shapes used as packing inside towers to increase vapor–liquid contact area for mass transfer. Rings (Raschig rings) are hollow cylindrical pieces that create many surfaces for interaction as the liquid and vapor flow around them. Saddles (Berl saddles) are curved, saddle-shaped pieces that similarly maximize surface area and promote efficient mixing with relatively low pressure drop. The option that lists Rings and Saddles together directly matches these common packing types, which is why it’s the best choice. Other options refer to different tower internals or packing forms (grids, plates, beads) but do not pair rings and saddles.