Which element of the CIA triad is Theresa concerned about due to potential maintenance delays?

In this scenario, Theresa's concern about potential maintenance delays directly relates to the element of availability in the CIA triad. Availability ensures that information and resources are accessible to authorized users when needed. Maintenance delays can lead to system downtime or unavailability of services, which can hinder users' ability to access critical data or applications. Therefore, if Theresa's focus is on how maintenance delays might affect access to systems or information, it illustrates a concern for maintaining the availability of those systems.

In contrast, confidentiality involves protecting information from unauthorized access and disclosure, while integrity focuses on ensuring the accuracy and trustworthiness of data. Accountability pertains to the ability to track user actions and maintain a secure audit trail. None of these elements are directly impacted by maintenance delays in the same way that availability is.