The three sangams were organized under the chairmanship

The three sangams were organized under the chairmanship of which of the following?

[A] Rishi Agastya, Nakkirar, Rishi Agastya
[B] Rishi Agastya, Rishi Agastya & Nakkirar
[C] Nakkirar,Rishi Agastya, Rishi Agastya
[D] None of the above

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