How to covert bnf to ebnf from that !? bnf <Z> ::= DCd | D<N>C

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How to covert bnf to ebnf from that !?

BNF

 <Z> ::= DCd | D<N>C 

EBNF

<Z> ::= D[<N>}C[d]

or
 
<Z> ::= D[<N>C[d]]

(i think that what wrong in grammar?)

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