Site-local address-a. correct: typically you would use a site-local address. if every device on the subnet had a global address, you could also use global addresses, but this option is not given in the question.b. incorrect: if you use link-local addresses, you need to specify their interface ids. also, link-local addresses are not dynamically registered in windows ddns. it is thereforemuch easier to use site-local addresses and typically they are used for this purpose.c. incorrect: only two special addresses exist, :: and ::1. neither can implement ipv6 connectivity over a private network.d. incorrect: an anycast address is configured only on a router and cannot implement ipv6 connectivity over a private network. also, it is not a unicast address.