Select the letter-cluster from among the given options that can replace the question mark (?) in the following series.
BJT, DHV, FFX, ?, JBB
BJT ==>Â (B+2) (J-2) (T+2) ==>Â DHV
DHVÂ ==>Â (D+2) (H-2) (V+2) ==> FFX
FFX ==>Â (F+2) (F-2) (X+2) ==> HDZ
HDZ ==>Â (H+2) (D-2) (Z+2) ==> JBB
Hence 'HDZ' will come in place of the question mark.
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