Final answer:
The required UTM parameters for accurate tracking in the 'All Traffic' report are utm_campaign, utm_source, and utm_medium; utm_term and utm_content are optional.
Step-by-step explanation:
In the context of campaign tracking for web analytics, when you want to ensure accurate data shows in the “All Traffic” report, the required Universal Tracking Module (UTM) parameters are: utm_campaign, utm_source, and utm_medium. These parameters allow you to specify the campaign name (utm_campaign), the source of your traffic (utm_source), like a search engine or newsletter, and the medium (utm_medium), such as email or CPC, to track how users are getting to your site. While utm_term and utm_content can also be used, they are optional and serve to provide additional details like keyword terms for paid search (utm_term) or the content of the ad or link (utm_content).