The correct option is When litigation or a regulatory investigation is reasonably anticipated.

This is the standard trigger for imposing a legal hold because it creates a legal duty to preserve potentially relevant information. A legal hold is meant to suspend routine deletion and retention processes and to ensure that custodians and backups are preserved until the dispute or inquiry is resolved.

Cloud Storage Coldline is incorrect because it names a storage class and not a timing trigger for preservation. Choosing a storage tier does not by itself start a legal obligation to preserve records.

When data is scheduled for routine deletion under retention policies is incorrect because an upcoming deletion schedule is an event that could be affected by a legal hold but it is not the legal trigger. The duty to impose a hold arises when litigation or an investigation is reasonably anticipated and not merely when a retention policy would otherwise delete data.

Only when a new enterprise application is launched is incorrect because launching applications is unrelated to the legal standard for preservation. A new application does not create the foreseeable dispute that requires a legal hold.

Full AWS Practitioner Certification Question