.docx is the default file extension on a Word doc.
Many admins set their firewalls to drop echo-request packets to prevent their networks from being mapped via "Ping Sweeps".
A remote possibility is that there's too many hops between the source and target and the packet's TTL expires.
Answer:
SOA
Explanation:
Statement of Authority, or you could also say that the zone that has been created is a reverse lookup