A unit needs to select 20 blood donors from 100 applicants for medical examinations. The people most likely to be selected are those who have donated blood since 2000, or those who have failed the blood donation medical examination since 2002. If the above assertion is true, then the following? Are most likely to be selected. ['Xiao Zhang donated blood in 2002. His blood type is O type, which has the highest medical value.', 'Xiao Liu enrolled for blood donation in 2003. Because of the unsuccessful "Australian Antibodies" positive physical examination, he issued a certificate of "Australian Antibodies" turning negative, and resolutely requested blood donation.', "Da Chen's last blood donation was in 1999. He was amputated due to a public injury, and the blood of volunteer blood donors was flowing in the blood vessels. He said, I have no reason to donate blood.", 'Old grandson failed to donate blood due to unqualified medical examination in 2000 and qualified blood donation in 2002.']