Blockchain technology

A$.$ uses a low$-$cost$,$ decentralized$-$ledger approach to dealing with data.

B$.$ gives all appropriate parties access to one body of encrypted data.

C$.$ helps put doctors, patients, and insurers on the same page.

D$.$ All of the above.

One goal of blockchain

A$.$ would be for all patients to be able to manage their own records.

B$.$ would be for Change Healthcare to handle most U$.$S$.$ doctors.

C$.$ is for MIT to sell the software to MedRec.

D$.$ is to avoid the fallacy of a "single source of truth."