Based on the scenario, the part of the C-I-A security triad that has failed is maintaining availability.
The C-I-A security triad refers to an abbreviation for confidentiality, integrity and availability. It can be defined as a cybersecurity model that is designed and developed to guide security policies for information security in an organization, so as to effectively and efficiently protect and make their data available to authorized end users.
In this scenario, the part of the C-I-A security triad that has failed is maintaining availability because the database server hardware cannot be replaced immediately if it fails.
Read more on data here: brainly.com/question/25558534