Which motherboard form factor has been largely replaced by other sizes but still exists?

The option that accurately describes a motherboard form factor that has been largely replaced but still exists is Mini-ATX. This form factor was originally designed to be a smaller alternative to the Standard ATX size, catering to compact PC builds. However, as technology and design preferences evolved, other form factors like Micro-ATX and ITX variants gained popularity due to their more compact nature and improved layouts, making them more suitable for modern systems.

While Mini-ATX may still be found in some systems, it is not commonly used in newer builds and has largely fallen out of favor. This context highlights how the Mini-ATX had a specific niche in the past that has since been overshadowed by other, more efficient motherboard designs.