Final answer:
The best method for installing an operating system across the network is PXE (Preboot Execution Environment). It allows a computer to boot and install the OS via the network.
Step-by-step explanation:
The method for installing an operating system across a network is best described as PXE (Preboot Execution Environment). This allows a computer to boot up and install the operating system through the network, without the need for local storage such as a hard drive or a CD/DVD. Devices on the network can boot up using a network interface independently of available data storage devices or installed operating systems.
USB 3.0 and IEEE 1394 are types of physical connection standards, typically used for connecting external devices such as storage drives, but not primarily for network installations. NTFS (New Technology File System) is a file system