COB questions about which sororities are recruiting

Hey! I submitted a COB request form last week and so far I have received 2 sororities that have reached out! I was wondering if anyone knew what all sororities are participating in COB? I know I am not guaranteed to be reached out to by all that are in COB and am very grateful for the ones that have reached out. I just want to see if there are any other sororities participating before I just go ahead an accept a bid. I feel bad keeping someone waiting but I want to have the full picture before I make such a big decision. Also, please let me know if they are expecting me to reach out. I spoke to several people in the fraternity/sorority life office and they said that all participating sororities will receive my form so I don't need to reach out. Thank you so much for any help!