Correct Answer: A, CTo gather information about the vCenter database and check for potential disk space issues, an administrator can use tools that provide insights into disk usage. The vCenter Management Interface (VAMI) is a tool specifically designed for managing and monitoring vCenter Server, including performance and health metrics, which makes it useful in this scenario. The 'df' command, although not presented as a tool in a traditional sense, is essential for determining disk usage on Unix-based systems, including the underlying Photon OS used by vCenter Server Appliance (VCSA). Therefore, both VAMI and the 'df' command are appropriate choices for the administrator.