Which two roles are valid when inviting a new administrator into a Mist organization?

In the context of inviting a new administrator into a Mist organization, the Helpdesk role is a valid option because it is specifically designed for personnel who need access to support functions and basic operational tasks related to network management. This role typically allows administrators to assist with troubleshooting and user support without granting them full privileges that would be available to higher-level administrators.

The other roles listed, such as Network admin, System analyst, and Database manager, do not align with the standard roles available for the Mist platform. The Network admin role would imply more advanced capabilities regarding configuration and management of the network, which might not be suitable for someone in a basic support capacity like a helpdesk staff. System analyst and Database manager roles are not typically recognized in the context of Mist's administrative structure, as they suggest responsibilities outside of the core functions that Mist focuses on, which are more network-centric and aligned with operational management. Thus, the Helpdesk role stands out as the appropriate choice for inviting new administrators.