The correct answer is mSATA because it represents a form factor that is a miniaturized version of a traditional interface, specifically designed for small devices such as laptops and tablets. NVMe is a newer protocol specifically developed for SSD technology which uses PCIe lanes to transfer data at higher speeds, and while it's suitable for compact systems, it's not defined by miniaturized legacy interfaces. PCIe itself is an expansion card interface standard, not a form factor for storage devices. The 2.5-inch form is a typical size for HDDs and SSDs but is larger than what would typically be used in ultra-portable devices where mSATA could be found.