Which of the following is NOT a key location where videos can appear on YouTube?

The correct answer focuses on the nature of video placement on YouTube. Videos can be found in various key locations within the platform, such as search results, the homepage, and a user’s subscriptions.

When users conduct a search on YouTube, the search results page displays videos that are relevant to the user’s query, helping them find content easily. The homepage is designed to showcase popular videos or those tailored to individual user preferences based on previous interactions, creating a personalized viewing experience. Similarly, subscriptions allow users to see the latest uploads from channels they follow, ensuring they don’t miss new content from their favorite creators.

The option referring to a "sponsored page" is misleading because while sponsored content can appear on YouTube, it is not a fundamental location specifically designated for video presence like the other options listed. Sponsored content is generally found through advertisements or promotions rather than being an inherent part of YouTube’s layout or user journey in the same way as search results, the homepage, or subscriptions. This distinction is crucial in understanding the primary ways users interact with video content on the platform.