Internet and Web

PNG stands for Portable Network Graphics, a lossless image compression format. It was developed as an improved replacement for GIF. The name reflects its portability across different platforms and network-friendly design for web use.

MIME stands for Multipurpose Internet Mail Extensions, an internet standard that extends email format to support text, images, audio, video, and other non-text attachments. It allows email systems to handle diverse content types beyond plain text.

Just Ask in Ultimatix is an enterprise social Q&A platform for knowledge sharing within organizations. It's designed for employees to ask and answer work-related questions. It's not a quizzing zone, entertainment platform, or general social networking site - those serve different purposes.

The slogan of JustAsk (a Tata Consultancy Services internal knowledge platform) is 'Ask Answer Discover'. This reflects the platform's purpose of enabling employees to ask questions, get answers, and discover knowledge. The other options are plausible but not the actual slogan.

MyDoom (2004) holds the record as the fastest-spreading mass-mailing worm in history, reaching its peak within hours of release. ProRat is a Remote Access Trojan, not a mass-mailer. Blaster worm propagated via network vulnerabilities (SMB), not email. Sobig worm was indeed a mass-mailer but MyDoom's spread rate was unprecedented, sending over 100 million infected emails in its first 24 hours.

Santy (2004) is widely considered the first webworm - it spread by exploiting a vulnerability in phpBB web forum software and used Google to identify new targets. Sasser spread via Windows SMB vulnerabilities. Witty worm targeted ISS security products via network. Bandook is a trojan, not a worm. Santy was unique because it used search engines to find and propagate through web applications.

YAHOO stands for 'Yet Another Hierarchical Officious Oracle'. The claimed answer D is correct. Option A has 'officiour' (typo). Option B has 'operating' instead of 'officious'. Option C has 'highrated' (should be 'hierarchical') and 'officious' is spelled correctly but 'highrated' is wrong.

Marshall Brain founded HowStuffWorks.com in 1998 as a website dedicated to explaining how things work. Christopher Nolan is a film director, not associated with this educational site.

Facebook's email service was codenamed Project Titan, intended to compete with Gmail. The project was launched in 2010 as a full email system but was discontinued as users increasingly preferred messaging and social networking over traditional email.

Wikipedia was launched on January 15, 2001 by Jimmy Wales and Larry Sanger. Google was founded in 1998, Yahoo in 1994, and Rediff in 1996. Wikipedia became the world's largest free encyclopedia allowing anyone to edit articles.

WWW stands for World Wide Web, which is the system of interconnected documents and resources linked by hyperlinks on the internet. The other options are either misspelled or nonsensical.

YAHOO stands for 'Yet Another Hierarchy of Officious Oracle' - a name coined by founders Jerry Yang and David Filo as a tongue-in-cheek reference to the word's definition in Jonathan Swift's Gulliver's Travels. The name represented their approach to organizing the growing web into a hierarchical directory. The other options with variations of 'higher/heap/highest' are incorrect mnemonics sometimes confused with the actual acronym.

MaxSearch is not a recognized search engine, while Mamma (a meta-search engine), Gigablast (an independent search engine), and Excite (a web portal and search service) are all real search engines. This tests knowledge of web search tools and internet history.

YAHOO stands for 'Yet Another Hierarchical Officious Oracle'. This backronym was coined by founders David Filo and Jerry Yang. 'Hierarchical' refers to the directory structure, and 'Officious Oracle' implied the site would provide helpful guidance. Despite common misconceptions, this is the widely accepted full form.