For an existing PostgreSQL database server managed by NDB, additional databases are added by updating the applicable database server parameters through the NDB graphical interface. The Database Parameters Profile represents PostgreSQL instance-level configuration and allows NDB to apply the supported database definition and configuration consistently. Creating additional Time Machines would protect separate database entities but would not create the databases themselves. A Software Profile contains the operating-system and PostgreSQL binaries used for provisioning database server VMs; replacing it is unnecessary for adding databases to an existing instance. A post-provisioning script is also not the standard managed workflow because it would bypass the profile-based configuration maintained by NDB. Therefore, option B is correct: the administrator should modify the Database Parameters Profile for the existing PostgreSQL server. Nutanix PostgreSQL Database Parameters Profile documentation