Final answer:
The administrator can utilize AWS Artifact to acquire security and compliance reports as well as online service agreements with AWS.
Step-by-step explanation:
The service that the administrator can utilize to acquire the security and compliance reports as well as online service agreements between the organization and AWS is AWS Artifact. AWS Artifact is a service that provides access to various compliance reports, such as SOC (Service Organization Control) reports and PCI (Payment Card Industry) reports. It also includes online service agreements that can be reviewed and downloaded.