You found these lines in the modules.dep file:
/lib/modules/2.2.5-15smp/fs/msdos.o:
/lib/modules/2.2.5-15smp/fs/fat.o
Which of the following is true?

A.
The msdos module is dependent upon fat.

B.
The fat and msdos modules cannot be loaded manually.

C.
The fat and msdos modules are automatically loaded at startup.

D.
The fat module is a submodule to the msdos module.