Given these fragments from within a single tag in a Java EE DD:
Which are true? (Choose all that apply.)
A. A Java EE DD can contain a single tag in which all of these tags can legally co-exist.
B. It is valid for more instances of <auth-constraint> to exist within the single tag described above.
C. It is valid for more instances of <user-data-constraint>
to exist within the single tag described above.
D. It is valid for more instances of <url-pattern> to exist within the <web-resource-collection> tag described above.
E. It is valid for other tags of the same type as the single encasing tag described above to have the same <url-pattern> as the tag above.
F. This tag implies that authorization, authentication, and data integrity security features are all declared for the web application.
Book's answer: ABDEF
I think that it should be: ADEF
It is valid for 0 or 1 instances of <auth-constraint> to exist within the single tag described above.