Alex has configured full-disk encryption for laptops that his organization issues to employees. What cybersecurity objective does this primarily support?

Full-disk encryption primarily supports confidentiality by preventing unwanted access to the drive if it is stolen or otherwise exposed. The three objectives are confidentiality, integrity, and availability, which means authenticity is not a possible answer. Encryption does not increase availability, and integrity ensures that data has not been changed inadvertently or maliciously. Thus, encryption can help, but it is not as strong of an answer as confidentiality.