Question 6 Which of the following does NOT look like a terminal in a BNF grammar? true Question 7 Which phrase best defines metasymbols? Symbols that are only used in grammars for computer programming languages A collection of symbols that should never be used in the grammar Symbols that are just part of the BNF notation, like the production symbol =) and ellipse (...) Symbols standardized by the Medical Equipment and Technology Association Question 10 Consider the grammar for a language specified by the following rules: ::= [ ] ::= 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 The string 999 is syntactically valid according to these rules. True False Question 9 According to the following production rules: :: ::= | ::= 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 which of the following strings are valid according to the grammar ? 53 842 0011