You have run the association rules algorithm on your data set, and the two rules {banana, apple} => {grape} and {apple, orange}=> {grape} have been found to be relevant. What else must be true?

A.
{grape,apple,orange} must be a frequent itemset.

B.
{banana,apple,grape,orange} must be a frequent itemset.

C.
{grape} => {banana,apple} must be a relevant rule.

D.
{banana,apple} => {orange} must be a relevant rule.