Which tag handler method allows the citation tag to access the document tag?

You are creating a content management system (CMS) with a web application front-end.
The JSP that displays a given document in the CMS has the following general structure:

The citation tag must store information in the document tag for the document tag to generate a
reference section at the end of the generated web page.The document tag handler follows the
Classic tag model and the citation tag handler follows the Simple tag model. Furthermore, the
citation tag could also be embedded in other custom tags that could have either the Classic or
Simple tag handler model. Which tag handler method allows the citation tag to access the
document tag?

A.
public void doTag() {
JspTag docTag = findAncestorWithClass(this, DocumentTag.class);
((DocumentTag)docTag).addCitation(this.docID);
}

B.
public void doStartTag() {
JspTag docTag = findAncestorWithClass(this, DocumentTag.class);
((DocumentTag)docTag).addCitation(this.docID);
}

C.
public void doTag() {
Tag docTag = findAncestor(this, DocumentTag.class);
((DocumentTag)docTag).addCitation(this.docID);
}

D.
public void doStartTag() {
Tag docTag = findAncestor(this, DocumentTag.class);
((DocumentTag)docTag).addCitation(this.docID);
}

Explanation: