Which of the following protocols is used for ping commands that use hostnames instead of IP addresses?

Windows 8.1 uses WPA2-Enterprise for maximum security when communicating by means of an ad hoc wireless network (direct communication with another wireless computer without use of an access point)

Indicate whether the statement is true or false

If a program attempts to insert a duplicate key into a set:

a. An exception is thrown. b. The set will contain multiple copies of that key. c. A compile error will occur. d. The duplicate key will be ignored.