Choose two statements that are right.

Overlaying a sitemap with log files can reveal discrepancies between intended site structure and actual crawler behavior. If log files show that certain pages listed in the sitemap are rarely or never visited by crawlers, it could indicate a lack of internal links pointing to those pages, signifying a flawed site architecture that prevents proper discoverability. Combining data from log files (real crawler visits) and web crawls (simulated crawler behavior) is a powerful analytical technique. This comparison helps identify issues like pages being missed by real crawlers despite being discoverable in a simulated crawl, or vice versa, providing a comprehensive understanding of how search engines interact with a website. Conversely, relying on a single data source for deep analysis is generally insufficient, as each source offers a partial view. Combining multiple data sources provides a more holistic and accurate picture.