Choose the correct statement about mark-up.

The correct statement is that changes in HTML can break the mark-up, so monitoring is needed. Structured data (mark-up) relies on specific HTML elements and their attributes. Any alterations to the underlying HTML structure, such as changing element IDs, classes, or even the nesting of elements, can invalidate the structured data, making it unreadable or incorrectly interpreted by search engines. Regular monitoring ensures that structured data remains valid and effective for SEO. Invalid mark-up does not work as intended; search engines will ignore or misinterpret it, leading to a loss of rich results. Therefore, controlling and validating mark-up is crucial. Even if Google Search Console (GSC) reports invalid mark-up, Google will not consider it for rich results. GSC's warnings are precisely to alert you to issues that prevent your structured data from being utilized.