According to the text, what are researchers trying to find out about the Omicron variant? Whether existing COVID vaccines protect us from the late...

According to the text, what are researchers trying to find out about the Omicron variant?

Whether existing COVID vaccines protect us from the latest variant.
If the virus has mutated so much that it can escape COVID vaccines designed to protect us from earlier versions of the virus.
If vaccines may end up protecting us against Omicron after all, as they have done with earlier variants.
a) Only I is correct.
b) I and II are correct.
c) I, II, and III are correct.