Storage Engine: MMAPv1 in mongoDB

Quiz: Storage Engine: MMAPv1

To understand MMAPv1, it is important to know that it:
1.Maps data files directly into virtual memory.
2.Maps data coming through the socket directly onto disk.
3.Maps JSON directly to BSON.
4.Maps compressed data files directly into BSON.
5.Maps data files directly into physical memory.

Ans.
5.Maps data files directly into virtual memory.