The challenge response application can be administered by {HEAD ~ an issuer} or by a third party on behalf of {TAIL ~ an issuer} 
The challenge response application can be administered by { HEAD ~ an issuer } or by a third party on behalf of { TAIL ~ an issuer }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL