Welche Bedeutung steckt hinter der hier vorgestellten Vokabel aus dem Bereich Office gossip?

Gudrun: 'I've just received confirmation that I can attend the 3-week English course in Cambridge!' Holly: 'You must be over the moon.'

to be over the moon

Do you know what it means?

• to be grateful
• to feel self-satisfied
• to be very pleased