To answer this question, you need to understand the concept of availability and how it relates to information security.
Option A) Denial of services - This option is incorrect because availability helps protect against denial of services. Denial of services refers to the intentional disruption or prevention of access to a system or network, making it unavailable to users. Availability measures, such as redundancy and load balancing, are implemented to ensure continuous access to information despite denial of service attacks.
Option B) Fires, floods, and hurricanes - This option is incorrect because availability helps protect against natural disasters. Fires, floods, and hurricanes can cause physical damage to infrastructure and equipment, leading to the loss of data and system downtime. Availability measures, such as offsite backups and disaster recovery plans, are implemented to ensure that information remains accessible even in the face of such events.
Option C) Unreadable backup tapes - This option is incorrect because availability helps protect against the loss of readable backup tapes. Backup tapes are used to store copies of data for recovery purposes. If the backup tapes become unreadable due to errors or damage, the information may not be accessible when needed. Availability measures, such as regular testing and verification of backups, are implemented to ensure the integrity and accessibility of backup data.
Option D) Unauthorized transactions - This option is correct because availability does not directly protect against unauthorized transactions. Unauthorized transactions refer to unauthorized access or manipulation of data or systems, typically for financial gain or malicious purposes. Availability focuses on ensuring the continuous availability and accessibility of information, rather than specifically protecting against unauthorized transactions.
The correct answer is D) Unauthorized transactions. This option is correct because availability measures do not directly address protecting against unauthorized transactions. Other security measures, such as authentication, authorization, and encryption, are implemented to prevent unauthorized access and transactions.