public OPTRecord
getOPT() {
	Record [] additional = getSectionArray(Section.ADDITIONAL);
	for (int i = 0; i < additional.length; i++)
		if (additional[i] instanceof OPTRecord)
			return (OPTRecord) additional[i];
	return null;
}
Returns the OPT record from the ADDITIONAL section, if one is present.
@see OPTRecord
@see Section
src/main/java/core/org/xbill/DNS/Message.java