<P> The back of the card has a ghost image of the owner . And if applicable, the card also contains the date of birth, blood type, DoD benefits number, Geneva Convention category, and DoD Identification Number (also used as the Geneva Convention number, replacing the previously used Social Security Number). The DoD number is also known as the Electronic Data Interchange Personal Identifier (EDIPI). A Code 39 linear barcode, as well as a magnetic strip is placed on the top and bottom of the card . The DoD ID / EDIPI number stays with the owner throughout his or her career with the DoD or USCG, even when he or she changes armed services or other departments within the DoD or the USCG . For retired U.S. military personnel who subsequently become DoD or USCG civilians or DoD or USCG contractors, the DoD ID / EDIPI Number on their CAC will be the same as on their DD Form 2 Retired ID Card . For non-military spouses, unremarried former spouses, and widows / widowers of active, Reserve or Retired U.S. military personnel who themselves become DoD or USCG civilians or DoD or USCG contractors, the DoD ID / EDIPI Number on their CAC will be the same as on their DD 1173 Uniformed Services Privilege and Identification Card (e.g., Dependent ID card). </P> <P> The front of the CAC is fully laminated, while the back is only laminated in the lower half (to avoid interference with the magnetic stripe). </P> <P> The CAC is said to be resistant to identity fraud, tampering, counterfeiting, and exploitation and provides an electronic means of rapid authentication . </P> <P> There are currently four different variants of CACs . The Geneva Conventions Identification Card is the most common CAC and is given to active duty / reserve armed forces and uniformed service members . The Geneva Convention Accompany Forces Card is issued to emergency - essential civilian personnel . The ID and Privilege Common Access Card is for civilians residing on military installations . The ID card is for DOD / Government Agency identification for civilian employees . </P>

Which of the following is a function of the cac's integrated circuit chip (icc) feature