Additionally, there are {HEAD ~ many flexible implementation options} of {TAIL ~ the challenge response application} that can be adjusted based on factors such as the location of the merchant or the location of the cardholder 
of
Additionally , there are { HEAD ~ many flexible implementation options } of { TAIL ~ the challenge response application } that can be adjusted based on factors such as the location of the merchant or the location of the cardholder
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH