Explanation
The best option to support the organization's objectives of protecting data confidentiality while transporting data is encryption. Encryption is a process of transforming data into an unreadable form using a secret key or algorithm, so that only authorized parties can access the original data. Encryption protects the confidentiality of data in transit by preventing unauthorized interception, modification, or disclosure of the data. Encryption can also help comply with data privacy and security regulations, such as the GDPR and HIPAA.
The other options are not as effective as encryption in protecting data confidentiality while transporting data.
Cryptographic hashes are mathematical functions that generate a fixed-length output from an input, but they do not encrypt the data. Hashes are used to verify the integrity and authenticity of data, but they do not prevent unauthorized access to the data. Virtual local area network (VLAN) is a logical grouping of network devices that share the same broadcast domain, but they do not encrypt the data. VLANs can improve network performance and security by isolating traffic, but they do not protect the data from being intercepted or modified by external attackers. Dedicated lines are physical connections that provide exclusive access to a network or service, but they do not encrypt the data. Dedicated lines can offer higher bandwidth and reliability, but they do not guarantee the confidentiality of the data from being compromised by physical tampering or eavesdropping.
References:
ISACA, CISA Review Manual, 27th Edition, 2019, p. 2471
ISACA, CISA Review Questions, Answers & Explanations Database - 12 Month Subscription2 Data Security and Confidentiality Guidelines - Centers for Disease Control and Prevention3 Information Security | Confidentiality - GeeksforGeeks4

Explanation
The finding that should be of greatest concern to an IS auditor assessing the effectiveness of an organization's vulnerability scanning program is that results are not reported to individuals with authority to ensure resolution. This indicates a lack of accountability and communication for vulnerability management, which may result in unresolved or delayed remediation of identified vulnerabilities. This may expose the organization to increased risk of cyberattacks or breaches. The other findings are also concerning, but not as much as this one, because they may affect the completeness, accuracy or timeliness of the vulnerability scanning process, but not necessarily its effectiveness. References:
ISACA, CISA Review Manual, 27th Edition, chapter 4, section 4.41
ISACA, COBIT 2019 Framework: Introduction and Methodology, section 3.2

Explanation/Reference:
Explanation:
Intrusion is detected by the active monitoring and review of unsuccessful logons. User IDs and the granting of user privileges define a policy, not a control. Automatic logoff is a method of preventing access on inactive terminals and is not a detective control. Unsuccessful attempts to log on are a method for preventing intrusion, not detecting.