Gaby is marketing luxury vacations and notices ads are being triggered by queries for 'cheap vacations'. What should Gaby do to prevent this?

Using negative keywords is the correct approach because it prevents your ads from showing for irrelevant searches. By adding "cheap" as a negative keyword, Gaby ensures her luxury vacation ads won't appear when users are looking for budget options, thus improving ad relevance and reducing wasted spend. Lowering or increasing bids would not stop the ads from being triggered by the unwanted query; they only affect ad position or frequency. Using broad match would worsen the problem, as it expands the reach of keywords to include variations and related searches, potentially increasing the likelihood of matching with "cheap vacations.