Which one of the following is a search engine?

A virus hoax is usually an email that gets mailed in chain letter fashion describing some devastating highly unlikely type of virus, you can usually spot a hoax because there's no file attachment, no reference to a third party who can validate the claim and the general 'tone' of the message.

1983 Fred Cohen, while working on his dissertation, formally defines a computer virus as 'a computer program that can affect other computer programs by modifying them in such a way as to include a (possibly evolved)copy of itself.'

A new type of disc developed by Constellation 3D Inc. These discs can hold up to to 140 GB of data.

Before IBM created its personal computer, two types of computer systems, Apple II and CP-M, dominated the microcomputer world. Neither of these systems were PC compatible, or Mac-compatible (the two primary standards in place today). The original IBM PC became a new standard in the microcomputer industry. Since then, hundreds of millions of PC-compatible systems have been sold, as the original PC grew into a large family of computers and peripherals. More software has been written for this computer family than for any other system on the market.

PROM stands for Programmable Read Only Memory and is not a type of expansion slot or bus design. Today, PCI has become the most used expansion slot design in PCs. Older PCs incorporated both PCI and ISA slots for computability with older expanssion devices.

This was one of the most common viruses unleashed in 1988.

Time To Live specifies how many more hops a packet can travel before being dropped.

Subject directories tend to house fewer?sometimes more relevant?sites than those found through search engines. Sites in a subject directory often have been handpicked by editorial teams or specialists in a particular field.