Question

which of these is not an index filename? a index.html b index.htm c default.htm d default-index.html

Explanation:

Index filenames typically refer to default filenames like index.html, index.htm, or default.htm which are used as the main entry point for a website. Option D (default - index.html) is a combination and not a standard index filename format as the others are either "index" or "default" as the base name in a more standard way.

Answer:

D. default - index.html