Who had ever the only control of the airwaves in the UK EXCEPT ______?

The difference between cable television and broadcast television is that_____ . [ ] A: the programs of cable television are educational B: cable television does not use the public airwaves C: most cable television programs include sales messages D: cable television provides news and entertainment

What are the advantages of the mutual authentication procedure A: The secret keys are transmitted over the airwaves B: Encrypted random numbers are transmitted instead of secret keys C: The token can be encrypted using any algorithm D: A random key (session key) can be calculated from the random numbers generated for the security of the subsequent data transmission