Internet and Web

Twitter is an application and not a browser.

ARPANET (Advanced Research Projects Agency Network) was created by the US Department of Defense in 1969. It was the precursor to the modern Internet and was developed under the American government's DARPA agency.

In an email address, the domain name is everything after the @ symbol. Here, yahoo.co.in is the domain name that identifies the mail server, while 'user' is just the username or mailbox identifier.

Internet Explorer is a series of graphical web browsers developed by Microsoft.

.edu is used for educational purposes.

.com is the domain extension.

Mosaic, developed at NCSA and released in 1993, was the first widely-used graphical web browser. It popularized the World Wide Web by making it accessible with clickable links and images. Netscape was founded by Mosaic's creators but came later, Firefox is a much later browser (2002), and Internet Explorer was Microsoft's response to Netscape.

Tim Berners-Lee introduced the URL (Uniform Resource Locator) concept as a fundamental component of the World Wide Web in 1990 while working at CERN. Douglas Englebart pioneered hypertext, Jack Kilby invented the integrated circuit, and Konrad Zuse built the first programmable computer.

CALTIGER.COM was a web portal/website, not an Internet Service Provider (ISP). BSNL, VSNL, and GLIDE were/are ISPs that provide internet connectivity services to users.

Hypertext documents are linked through pointers (hyperlinks), which are references that connect one document to another. DNS is for domain name resolution, TELNET is for remote login, and Homepages are the main pages of websites.

Both Internet Explorer and Netscape Navigator are web browsers. The question uses confusing negative phrasing - option D 'none' is meant to indicate that none of the options are 'not browsers,' meaning both are browsers.

An extranet combines public internet accessibility with private intranet security, allowing controlled external access to internal resources for partners, customers, or suppliers while maintaining confidentiality of sensitive information.

Usenet is indeed a global discussion system where users post and read messages in organized newsgroups covering thousands of topics, functioning as an electronic bulletin board that predates the modern web forum.

This is an organisation with whose help one can get connected to the internet.

Blogs (weblogs) are personal logs or journal entries posted on the web, typically in reverse chronological order. Listservs are email distribution lists, webcasts are streaming broadcasts, and subject directories are organized collections of web links.