Tamil is the oldest with literature dating back to early centuries of Christian era. This developed during the three Sangams(assemblies of poets and writers) held during different times
In Southern India, the ancient Indian writings were written in four Dravidian languages which developed their own script and literature, these are, Tamil, Telugu, Kannada,Malayalam
Viharas were for the purpose of living, Chaityas were assemblies for the purpose of discussions. Further, Chaityas were with Stupas, Viharas did not have stupas.
EXAMIANS