Pepsi$-$Cola made "freshness" an important product attribute when it stamped freshness dates on its cans. Prior to doing so$,$ few consumers considered freshness a relevant issue for soft drinks. Pepsi$-$Cola tried to change consumers' attitudes toward its soft drinks by

changing beliefs about the extent to which a brand has a specific attribute.

reducing perceived risk.

changing the perceived importance of a specific attribute.

providing stimulus generalization.

adding a new attribute.