Question 20 Not yet answered Marked out of 1.00 Flag question What is the purpose of gas in the Ethereum blockchain? a. Gas is a petrochemical that is used to power the generators which house the nodes. b. Gas is a fee paid by participants to conduct transactions or execute smart contract code. c. Gas is a token used to pay for the cost of transactions Od. To create a unit of Ether that is constant regardless of the size of the transaction. Question 21 Not yet answered Marked out of 1.00 Flag question Which of the following are true of state channels? Select all that apply. a. State channels are on-chain transactions that only a subset of nodes sync in order to help with blockchain scaling issues. b. State channels are an example of a sidechain. O c. State channels can maintain records of transactions for parties even if they are offline. d. State channels allow for the clustering of transactions off-chain so that they can be brought on-chain as a group. Question 22 Not yet answered Marked out of 1.00 Flag question Which of the following are features that Bitcoin and Ethereum share? Select all that apply. a. Cryptographic tokens b. Consensus mechanisms c. Transactions d. An EVM that can run simple scripts e. A peer-to-peer networking infrastructure Question 23 Not yet answered Marked out of 1.00 Flag question Which of the following describe properties of sharding? a. Sharding occurs off-chain leaving more important processing on the main chain. b. Each shard confirms processes in other shards in order to strengthen the resiliency of the network. C. Sharding allows for operations to run in parallel in separate partitions of the network, increasing the overall processing speed of the blockchain.