At the top of the DNS hierarchy are the DNS authoritative servers that publish a directory of the root zone file.

____________________ is a technique to detect changes to information rather than encrypt and decrypt information.

Fill in the blank(s) with the appropriate word(s).

What type of door access control is a physical or electronic lock that requires a code in order to open the door?

a. key fob lock b. cipher lock c. biometric lock d. encrypted lock