According to Bhante Sujato, what is notable about the Saṃyutta Nikāya/Saṃyukta Āgama?

A. It was the last collection to be compiled in the pre-sectarian period
B. It was the only collection to be finalized in terms of both structure and content in the pre-sectarian period
C. It was the most widely used collection in the pre-sectarian period
D. It was the shortest collection in the pre-sectarian period
Answer: 