Which of the following characteristics relates to kerberos? a. a computer network authentication protocol that allows nodes communicating over a non-secure network to prove their identity to one another in a secure mannerb. a public interest research group in washington, d. c., established in 1994 to focus public attention on emerging civil liberties issues and to protect privacy, the first amendment, and constitutional values in the information agec. a round-robin database tool intended to handle time-series data like network bandwidth, temperatures, cpu load, and so on. d. dynamic random access memory (dram) that has a synchronous interface