Convert the BNF of Example $3\mathrm{.}3$ to EBNF.

$$

$=$

$$

$$A $|$ B $|$ C

$$

$+$

$|-$

$|()$

$|$

Does this grammar have any optional parts that should be denoted by brackets? Answer

Write the new line for this optional change or write NA if not applicable. Do not use spaces and use $->$ for the arrow. Answer

Does this grammar have any recusion that should be denoted by braces? Answer

Write the new line for this recusion change or write NA if not applicable. Do not use spaces and use $->$ for the arrow. Answer

Does this grammar have any multiple$-$choice options that should be denoted by parentheses and the OR operator? Answer

Write the new line for this multiple$-$choice change or write NA if not applicable. Do not use spaces and use $->$ for the arrow. Answer

Does this grammar have a line that could be a combination of the above options that should be denoted by brackets, braces, parentheses and the OR operator?Answer

Write the new line for this combination change or write NA if not applicable. Do not use spaces and use $->$ for the arrow. Answer

$$

$=$

$$

$$A $|$ B $|$ C

$$

$+$

$|-$

$|()$

$|$