In authenticated chat, user data along with _____ are returned.

In authenticated chat, user data is returned along with a signature. The signature serves as a secure verification method that assures the integrity and authenticity of the data being exchanged. It typically involves cryptographic components that verify that the information has not been altered in transit and that it originated from the expected source.

Using a signature in this context helps establish trust in the communication channel by allowing both the sender and the receiver to confirm each other's identities through cryptographic means. This is especially critical in ensuring that sensitive information shared during a chat remains secure and has not been tampered with.

The other options provided do not align with the typical practices of authenticated chat protocols. Passwords are not returned in the data exchange process for security reasons, while a secret ID might relate to identification but does not verify the authenticity of the transmitted data. A schedule, meanwhile, does not have a relevant connection to the mechanism of authentication in chat communications. Thus, the use of a signature is the appropriate context for ensuring secure and authenticated chat interactions.