Using the classification rule builder, an analyst needs to create a classification report for marketing tracking codes by the campaign name value codes. Below is an example of several tracking codes, where the item between the underscores represents the campaign name:
1. paid-search_non-branded-phrases_jeans
2. social-media_brand-awareness_twitter
3. display-advertising_brand-awareness_media-site
4. affiliates_shipping-discounts_affiliate-network
What kind of classification rule should the analyst create?