One argument in the security community is that lack of diversity is itself a vulnerability. For example, there are two dominant browsers, Mozilla Firefox and Microsoft Internet Explorer, that are used by probably 95 percent of Internet users. What security risk does this control of the market introduce? Suppose there were three (each with a significant share of the market). If not, would four? Five? Explain your answers.

What will be an ideal response?

A security flaw in any one affects a huge number of users. With a large user population, even one-­?third of the population is large.