Final answer:
The marketer should enter the keyword list into the Page Meta Tags or SEO Settings of the landing page to optimize it for SEO. 'SEO Details' is not a commonly used term, and 'Override Template Behavior' is for template customization, not for entering keywords.
Step-by-step explanation:
To ensure that a landing page is optimized for SEO, after creating a keyword list, a marketer should typically enter this information into the Page Meta Tags or the SEO Settings section of the page platform. While 'SEO Details' could be a valid section depending on the content management system (CMS), it's not a standard term used across different platforms. 'Override Template Behavior' would not be the correct place to enter keyword information as this is generally used for customizing the functionality of a page template rather than SEO optimization