Which command is used to copy multiple files and entire directory trees in Windows?

The command that is utilized to copy multiple files and entire directory trees in Windows is 'robocopy'. This command is a robust file copying tool that is included with Windows; it is particularly effective for copying large sets of files and directories.

Robocopy, which stands for "Robust File Copy," offers several advanced options beyond what basic copy commands provide. It can handle interruptions and resume copying if transmission is interrupted. Additionally, it retains file attributes and can be configured to mirror directories, which is useful for backup or synchronization tasks. The ability to copy entire directory trees with ease and flexibility makes it a preferred choice for users needing to manage large amounts of data efficiently.

In contrast, the other choices either do not support copying entire directory structures or are not designed for copying multiple files efficiently. The 'copy' command is limited to copying single files or a group of files in a more straightforward manner without directory structure. The 'cut' command is designed to move files rather than copy them, while 'paste' is used to insert files after they have been copied or cut, rather than being responsible for the copying process itself. Therefore, 'robocopy' stands out as the most suitable choice for copying multiple files and entire directories in Windows.