Which of the following values of tagdir attribute of the taglib directive is invalid?
Choice B is correct
The "tagdir" attribute is used to specify the directory where the tag extensions are installed.
The valid values are /WEB-INF/tags/ directory or any of its subdirectory.
If any other value is given, a compilation error will occur. Thus, choices A and C are valid and hence incorrect.
I think d is also invalid.
JSP.1.10.2 The taglib Directive
tagdir - Indicates this prefix is to be used to identify tag extensions installed in the /WEB-INF/tags/ directory or a subdirectory. An implicit tag library descriptor is used (see Section JSP.8.4 for details). A translation error must occur if the value does not start with /WEB-INF/tags/. A translation error must occur if the value does not point to a directory that exists. A translation error must occur if used in conjunction with the uri attribute.