Which of the following are considered "passive" follow-up linkage sources?

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Passive follow-up linkage sources are external datasets that let a cancer registry update a patient’s status without contacting the patient directly. These sources are used by linking existing records rather than initiating outreach, making them passive in nature. Motor vehicle and driver license files provide up-to-date location and residency information, helping confirm where a patient lives or has moved. Centers for Medicare and Medicaid Services data offer enrollment and, for many patients, death information, which helps verify vital status without a direct interview. State voter registration files likewise allow locating individuals and verifying current status through routine administrative data. When combined, these sources continuously feed updates to the registry without active patient contact, so they are all considered passive follow-up sources.