When an East Asian country's economy grows beyond its optimal macroeconomic scale, but is still short of its maximum sustainable scale:

Which is the correct?

1.its growth becomes 'uneconomic' but remains ecologically unsustainable

2.its growth becomes both 'uneconomic' and ecologically unsustainable

3.its growth remains both 'economic' and ecologically sustainable

4.its growth remains 'economic' but becomes ecologically unsustainable