After a shell is no longer needed, what command can be given to exit the shell?

Which of the following ensures that messages originate from their advertised source?

A. Sender authentication B. Message integrity C. Message confidentiality D. Message availability

A sorting algorithm can be used to arrange a set of ________ in ________ order.

A) numeric values, ascending B) numeric values, descending C) strings, ascending D) strings, descending E) All of the above.