The greatest concern associated with the transmission of healthcare data across the internet is unencrypted data, as this exposes the data to unauthorized access, interception, modification, or disclosure, which may compromise the confidentiality, integrity, and availability of the data. Healthcare data is sensitive and personal information that may include medical records, diagnoses, treatments, prescriptions, insurance claims, and biometric data. Healthcare data is subject to various legal and regulatory requirements, such as the Health Insurance Portability and Accountability Act (HIPAA) in the United States, that mandate the protection and privacy of the data. Encryption is a method of transforming the data into an unreadable format that can only be accessed or restored by authorized parties who have the decryption key. Encryption helps to prevent or reduce the risk of data breaches, identity theft, fraud, or other malicious attacks. The other options are not the greatest concerns associated with the transmission of healthcare dataacross the internet, although they may pose some challenges or issues. Lack of redundant circuits is a concern for the reliability and continuity of the data transmission, but it does notaffect the security or privacy of the data. Low bandwidth connections is a concern for the speed andefficiency of the data transmission, but it does not affect the security or privacy of the data. Data integrity is a concern for the accuracy and completeness of the data, but it does not necessarily depend on the encryption of the data. References = Risk and Information Systems Control Study Manual, Chapter 4: Risk Response, page 156.