Question 17 grammar is a tool used to describe the semantic rules. O Syntax Semantic O Meaning O Attribute Question 18 1 pts Which of the following can be one of the attributes for an expression in an attribute grammar? Its length. O Its size. O Its value. O Its type. Question 19 Which of the following is NOT a practical solution to the "dangling else" problem? O Using explicit "end-markers". 0 Annotating ambiguous syntax with additional rules. O Disallowing nested if statements O Using indentation to clarify programmers' intension