The largest commissure of the brain:
Commissure of Ganser
Commissure of Gudden
Corpus callosum
Both (A) & (C)
The corpus callosum is the largest commissure of the brain. It connects the two cerebral hemispheres. Since it is the neopallial commissure, it attains enormous size in man (10 cm long).
Parts of brain connected 
The corpus callosum connects all parts of the cerebral cortex of the two sides, except the lower and anterior parts of the temporal lobes which are connected by the anterior commissure.