Final answer:
The requirement of the proof of authority algorithm is that a few members have known identities.
Step-by-step explanation:
The correct answer is a. A few members have known identities.
The proof of authority algorithm is a consensus algorithm used in blockchain networks. It is designed to give authority to a few trusted members rather than relying on the computational power of miners. In this algorithm, a limited number of nodes or members are identified as authorities and have the power to validate transactions and create new blocks.
Learn more about Proof of Authority algorithm