The following EBNF grammar defines a language of signed decimal numbers. In this notation, inline alternatives can be delimited by parentheses and separated by vertical bars, optional elements are in square brackets and a sequence in curly braces can be repeated any number of times or, if immediately followed by a + symbol, one or more times. D->01 1| 21 3141516171819 Give a regular BNF grammar for this language, i.e., one that does not use the extra notation for inline alternatives, optional elements, or repetitions