What file system vulnerability does the following command take advantage of?

type c:anyfile.exe > c:winntsystem32calc.exe:anyfile.exe

A.
HFS

B.
ADS

C.
NTFS

D.
Backdoor access

Explanation:
ADS (or Alternate Data Streams) is a "feature" in the NTFS file system that makes it possible to hide information in alternate data streams in existing files. The file can have multiple data streams and the data streams are accessed by filename:stream.