What information is stored on disk on the NameNode? (Choose 4)

A.
File permissions of the files in HDFS.

B.
An edit log of changes that have been made since the last backup of the NameNode.

C.
A catalog of DataNodes and the blocks that are stored on them.

D.
Names of the files in HDFS.

E.
The directory structure of the files in HDFS.

F.
An edit log of changes that have been made since the last snapshot compaction by the
Secondary NameNode.

G.
The status of the heartbeats of each DataNode.