3. (8 pts) Given a sample zone file listed below, answer the following questions: SORIGIN example.com. designates the start of this zone le in the nanespace STTL 1h example.com. IN SOA ns.example.com. usernane.example.com. 2007120710 1d 2h 4w 1h ) example.com. IN NS ns example.com. IN NS s. somewhere.example. example.com. IN MX 10 mail.example.com. 1 default expiration tine of all resource records without their own TIL value IN MX 20 mai12.example.com. example.com. INA 192.0.2.1 IN AAMA 2001 :db8:10::1 IN A 192.0.2.2 IN AAAA 2001:db8:10:12 IN CNME exanple.com IN CAME IN A192.0.2.3 IN A192.0.2.4 wwwteat mail mai12 nai13 IN A 192.0.2. a. b. c. d. e. f. g. h. What is the server name for the DNS server of example.com? What is this DNS server's IPv4 address? What is the backup DNS server's name for example.com? What is the IP address of the web server for example.com? Do we have a backup web server? Why or why not? How many different URLs can we use to access the web server of example.com? How many mail servers are there for example.com? What are the IP addresses for the mail servers