A.  Binary data can be used directly by a map-reduce job. Often binary data is added to a sequence file.
B.  Binary data cannot be used by Hadoop fremework. Binary data should be converted to a Hadoop compatible format prior to loading.
C.  Binary can be used in map-reduce only with very limited functionlity. It cannot be used as a key for example.
D.  Hadoop can freely use binary files with map-reduce jobs so long as the files have headers

Answer: A