Select the option that is related to the third letter-cluster in the same way as the second letter-cluster is related to the first letter-cluster.
HP : DT :: RX : ?
HP ==>Â (H-4) (P+4) ==>Â DT
RX ==>Â (R-4)Â (X+4) ==> NB
Hence option (d) is the correct answer.
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