Which of the following should be a risk practitioner's GREATEST concern upon learning of failures in a data migration activity?

Availability of test data is a concern during the testing phase, but not the greatest concern when migration itself fails, as the actual production or migrated data's state is more critical.

Data integrity refers to the accuracy, consistency, and reliability of data over its entire lifecycle. Failures in data migration directly risk corrupting, losing, or incorrectly transferring data, making integrity the paramount concern for a risk practitioner.

Cost overruns are a financial consequence, not a direct technical data-related risk from migration failure.

System performance might be affected post-migration, but the immediate and most critical data-related risk from migration failure is the data's integrity.