Which of the following characteristics are key technical SEO ranking factors?

Key technical SEO ranking factors primarily focus on the aspects that affect how search engines crawl, interpret, and index a website. The characteristics of site speed and HTTPS are crucial in this context.

Site speed is essential because it directly impacts user experience; faster-loading pages tend to retain visitors better and lead to lower bounce rates. Search engines prioritize user experience, so a website that performs poorly in terms of speed may rank lower in search results.

HTTPS is another significant factor, as it indicates a secure connection. Websites secured with HTTPS are considered trustworthy, and search engines like Google favor secure sites over those that do not use encryption. This trust factor can influence ranking positively.

The other options, while important in the broader context of SEO, do not specifically fall under the category of technical SEO ranking factors. Content length and originality relate more to content SEO; domain authority and backlinks are crucial for off-page SEO; and keyword placement and image optimization focus on on-page SEO elements. Together, these elements form a comprehensive SEO strategy, but site speed and HTTPS are the key technical aspects that directly influence how well a site can perform in search engine rankings.