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.
Java applet
B.
Signed script policy:
C.
Pop-ups
D.
Cookies
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 D 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 B is incorrect. Signed script policy is a policy in which testing is required to check the
identity of a user sending requests from aWeb 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 A 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.