Which of the following is a true statement about using a separate "m." site for your content?

A separate "m." site, which is specifically designed for mobile users, often creates a challenge in terms of maintaining consistency across multiple versions of a website. This is because each version may require separate content management and updates. If updates are made to the desktop version, the mobile version might not reflect those changes unless manually updated as well, which can lead to discrepancies in content, design, and functionality.

Using a separate mobile site can also complicate SEO efforts and user experience, as developers may have to ensure that both versions provide similar navigational paths and information while addressing the unique needs of mobile users. Thus, while a separate "m." site can provide a tailored experience for mobile users, it comes with the caveat of increased complexity in maintaining consistency across both versions, which is elaborated in the correct answer.