Which scanning technique may still be used in modern HDTVs?

Interlaced scanning is indeed a technique that has historical relevance and, while it may not be as commonly emphasized in modern HDTV technology as progressive scanning, it is still utilized in certain contexts. Interlaced scanning works by displaying alternate lines of an image in two fields, effectively creating the complete image by combining these fields. This method was originally developed to reduce bandwidth in analog television broadcasts, which is why it is retained in some legacy systems and formats.

In modern HDTVs, progressive scanning has become the preferred technique for its ability to provide smoother and clearer images, as it displays all lines of the image sequentially. However, interlaced scanning can still appear in practice, especially when dealing with older content or equipment that was designed with this format in mind. It's important for anyone working with video technology to understand both interlaced and progressive techniques, given that they might encounter a variety of media formats in use.

Mixed scanning, while a term that could describe a combination of techniques, is not recognized as a standard scanning method and thus does not apply in this context. The option of "None of the above" is also not applicable, as interlaced scanning continues to have a presence in specific scenarios, reaffirming its relevance in the discussion