What is the purpose of the conditional HTTP GET request message?

Group of answer choices

To allow a server to only send the requested object to the client if this object has changed since the server last sent this object to the client.

To allow a server to only send the requested object to the client if the client is authorized to received that object.

To allow a server to only send the requested object to the client if the server is not overloaded.

To allow a server to only send the requested object to the client if the client has never requested that object before.