Which if the following is not a valid example of a web schema?

Which of the following issues will cause a device to have an IPv4 address starting with 169.254.?

a. Cannot get IP address from DHCP server b. Device exposed to public Internet with DMZ c. Port forwarding configured for device d. Device also has an IPv6 address.

Explain how default methods enable you to add new methods to an existing interface without breaking the classes that implemented the original interface.

What will be an ideal response?