What part of the URL, http://www.cisco.com/index.html, represents the top-level DNS domain?

Question:
What part of the URL, http://www.cisco.com/index.html, represents the top-level DNS domain?

• .com
• www
• http
• index

Explanation: The components of the URL http://www.cisco.com/index.htm are as follows:
http = protocol
www = part of the server name
cisco = part of the domain name
index = file name
com = the top-level domain

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