It is not #3, if we believe what they say in the study: "The test had a 98.3% specificity and 100% sensitivity" I.e. only 1.7% likelihood of false positives

It is not #3, if we believe what they say in the study: "The test had a 98.3% specificity and 100% sensitivity" I.e. only 1.7% likelihood of false positives EDIT: And no case was missed