Which of the following are a form of online advertising on the World Wide Web intended to attract
Web traffic or capture email addresses?

A.
Pop-ups

B.
Signed script policy:

C.
Cookies

D.
Java applet

Explanation:

Pop-up ads or pop-ups are a form of online advertising on the World Wide Web intended to attract
Web traffic or capture email addresses. It works when certain Web sites open a new Web browser
window to display advertisements. The pop-up window containing an advertisement is usually
generated by JavaScript, but can be generated by other means as well.
Answer option C is incorrect. A cookie is a small bit of text that accompanies requests and pages as
they move between Web servers and browsers. It contains information that is read by a Web
application, whenever a user visits a site. Cookies are stored in the memory or hard disk of client
computers. A Web site stores information, such as user preferences and settings in a cookie. This
information helps in providing customized services to users. There is absolutely no way a Web server
can access any private information about a user or his computer through cookies, unless a user
provides the information. A Web server cannot access cookies created by other Web servers.
Answer option B is incorrect. Signed script policy is a policy in which testing is required to check the
identity of a user sending requests from a Web browser. In this policy, when a receiver receives a
request from the user to access some resources of his computer, he can grant or deny the access on
the basis of whether the request is coming from a trusted or a non-trusted source. If the receiver
permits the request, the code will run on the browser after further checks. An author converts the
code in the form of an encrypted text, which is recreated on the browser as a simple text. The code
will not run on the browser if there is any modification in the text.

Answer option D is incorrect. A Java applet is a software program written in Java language. It is
distributed as an attachment in a Web document and executed in a Java-enabled Web browser. Java
applets can run on almost any operating system without requiring recompilation.