Time and Permanence

In the sentence, what does for good mean?
When he left, he was extremely disappointed. I think he’s gone for good.

• permanently
• to a good place
• to seek good fortune
• to a foreign country

What does the sentence He has left the country for good mean?

• he has left the country for foreign goods
• he has left the country for his own benefit
• he has left the country permanently
• he wants to buy good things