What Happens When You Save Your Map Document in ArcGIS

Multiple Choice

What happens when you save your map document in ArcGIS?

A) All layers, tables, etc. are written to disk within the .mxd file.
B) Only the layers used in this session are saved within the .mxd file
C) The .mxd file contains information that describes where all layers, tables, etc. are stored.
D) The .mxd file contains all layers and data sources saved in a compressed file format.