True or False: CDTs can be deleted only by system administrators.

The statement that CDTs (Complex Data Types) can be deleted only by system administrators is correct. This restriction is in place to maintain data integrity and ensure that critical business processes are not inadvertently disrupted. CDTs are often utilized extensively across applications, and allowing only system administrators the authority to delete them helps safeguard against accidental deletions that could lead to cascading failures or loss of functionality in applications that rely on those data types.

This control is part of a broader governance strategy within environments that manage complex applications, as it places the responsibility for significant changes in the hands of individuals who have the appropriate insights and permissions. It's also important to consider that while developers may work with CDTs frequently, they do not have the same level of access for deletion, which reflects best practices in application lifecycle management.

The other options imply scenarios where deletions might be permitted outside of the administrators' authority, which does not align with the established governance model for managing CDTs in Appian.