Welche Bedeutung steckt hinter der hier vorgestellten Vokabel aus dem Bereich Chatting to colleagues?

Irina: 'How is our book selling?' Joan: 'We're on the brink of success! It's just been reviewed by our favourite critic. I've heard he really likes it.'

to be on the brink of something

Do you know what it means?

• very close to something
• to be nowhere near something
• to have a suspicion of something