Please answer these questions related toSecurity Service

Links to an external site.:

Which security service can assure a sender that people other than the receiver cannot see the content of a message sent from the sender$?$

Which security service can provide the identity of the sender$?$

Which security service can assure the receiver that the message the receiver have received is identical to the one which the originator sent?

Which security service can assure the receiver that the sender cannot deny sending a message and$/$or claim to have sent a different one?