security question

[Amruth Puppala]

This question is from Acutaltest.com

In a form-based authentication, what must be included in the HTML retrun from the URL specified by the <login-page> element?

A. a base-64 encoded user name and password
B. a form that POSTs to that j_security_check URL
C. an applet that requests the user name and password from the user
D. a hidden field that supplies the login-constraint used by the application

Please answer it ..Actually I didn't uderstood the question also..

[Tony romer]

Answer is b. You have to declare action in this way if you use FORM based authentication.

[Amruth Puppala]

Is j_security_check is manditory for form based authentication..
I have studied HFSJ but didn't find ..

[Tony romer]

Yes it is,
if you do not say this as an action,
then form based authentication is not triggered.
I did not study that book but you can google form based authentication and see some examples.