Please explain how the answers were obtained. What does it mean to be left/right associative? How do you Determine the presedence?

7) Given the grammar rules: A-> B -> C ?> C#A B?D C@B circle one?f the underlined choices in each statement below: # is left(right)associative @ ?s(left):ight associative $ is(left right associative precedence of # is higher ower equal to precedence of @ precedence of # is higher (lower)equal to precedence of $ precedence of is higher ower equal to precedence of $