a$)$ Compare and contrast different Consensus Mechanism used in blockchain, such as Proof of

Work$($PoW$),$ Proof of Stake$($PoS$),$ Delegated Proof of Stake$($DPoS$)$ etc. Enumerate the advantages and

disadvantages of each.

b$)$ Evaluate the use of Blockchain in Health Care Systems: How can Blockchain improve data security,

interoperability, patient privacy, and the sharing of medical records.