While auditing an Adobe Analytics implementation, an Architect discovers that reports built using the Marketing Channel dimension show a large proportion of "None'' visits. Which two steps should be taken to diagnose the problem? (Choose two.)

A large volume of "None" in Marketing Channel reports indicates that incoming hits do not match any of the defined channel rules. The two most fundamental areas to investigate are the rules themselves and the data they rely on. Reviewing the Marketing Channel Processing Rules (B) is essential to ensure they are logical and ordered correctly to capture all expected traffic. Checking that Internal URL Filters are configured correctly (D) is also critical, as an improperly configured filter can strip the external referrer from a user's first hit, preventing any referrer-based rules from matching and causing the visit to be categorized as "None".

A. Breaking down by Tracking Code is a useful secondary step to identify sources of "None" traffic, but it doesn't diagnose the root cause of the misconfiguration itself.
C. Reviewing Data Feeds is a highly granular step for deep-dive analysis, not a primary diagnostic action for a common issue like this.
E. Data Connector settings are specific to third-party data integrations and are an unlikely cause for a large, general proportion of "None" visits from typical web traffic.

1. Adobe Experience League. (2024). Marketing Channel Processing Rules. "If a hit doesn't match any of your defined rules, it falls into the 'None' bucket." Section: "Rule processing logic".

2. Adobe Experience League. (2024). Internal URL Filters. "Internal URL filters are important because they prevent internal referrers from being credited as a marketing channel. If a visit’s first hit has a referrer that matches an internal URL filter, the hit is not used for marketing channel attribution." Section: "How internal URL filters are used in Analytics".

3. Adobe Experience League. (2023). Troubleshoot Marketing Channels. "A large amount of 'None' in the Marketing Channels report is a common issue. It is almost always a configuration issue with either Internal URL Filters or Marketing Channel Processing Rules." Section: "Common Issues".