If three subzones are designated for each use, then which one of the following is allowed?

michellesheinker@gmail.com on August 26, 2020

Why not D?

I understand from the video why B is correct but why not D?

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Emil-Kunkin on November 3, 2023

Since R is not allowed in zone 1, d would force the following

1:
2: I I I R
3: R R

However, since r and h are never allowed to go together, this would force all three hs into 1, which would violate rule 2.