What is a post-engagement attribution window?

A time window for determining whether or not the user is likely to uninstall your app
A time window for crediting Twitter with conversions that happen after someone engages with your ads
A time window for crediting Twitter with conversions that happen after someone views your ads
A time window for crediting Twitter with conversions that happen after a certain time of day

The correct answer is:

A time window for crediting Twitter with conversions that happen after someone engages with your ads.