In Ada, the $$dangling else$$ problem was addressed by:

Choice $1$ of $4$:Adding an $$end marker$$ for the if statement to the grammar

Choice $2$ of $4$:Including a semantic rule in the language reference manual stating that an else clause matches the closest unmatched if clause

Choice $3$ of $4$:Using indentation to indicate which else clause matches which if clause

Choice $4$ of $4$:None of the above