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Question

Which among the following is a correct option in format for representing symbol and expression in Backus normal form?

a.

<symbol> ->expression

b.

<symbol>::=_expression_

c.

<symbol>=<expression>

d.

all of the mentioned

Answer: (b).<symbol>::=_expression_

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Q. Which among the following is a correct option in format for representing symbol and expression in Backus normal form?