Practice question

How many Compatibility Group letters exist under ADR Class 1 classification?

  1. 26 letters (A to Z)
  2. 6 letters (A, B, C, D, E, F)
  3. 4 letters (S, M, L, XL)
  4. 13 letters (A, B, C, D, E, F, G, H, J, K, L, N, S)

Answer: D — 13 letters (A, B, C, D, E, F, G, H, J, K, L, N, S)

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