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Which of the following objects do we need in order to infer that M was generated by Bob, and that M has never been modified since. Choose the minimum number required of these objects, and assume public keys are known to everyone: 1. {K((M)Kp,Bobj}KprSevver 2. {KpuBob} 3. M 4- {M} KServerBob 5- Hash(M) 6. { Hash (M)}Kposerver 7K 8- {K}K Priab 9- { Hash(M) KprServer.{ Hash(K) KprServor}) 10(M,M)