3. Multiple Choice For each question, select all that apply What can a malicious Bitcoin miner do? a) Create valid transactions originating from someone else's address b) Prevent a valid transaction...

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Extracted text: 3. Multiple Choice For each question, select all that apply What can a malicious Bitcoin miner do? a) Create valid transactions originating from someone else's address b) Prevent a valid transaction from getting any confirmations c) Ignore the longest valid branch rule when proposing a new block A 51% attacker (a=0.51) can potentially: a) Steal coins from an existing address b) Make it unprofitable for other miners to mine c) Change the block reward d) Suppress transactions from the block chain If two conflicting transactions A → B and A → C are both broadcast almost simultaneously from different nodes, what determines which one will eventually end up in the block chain? a) The transaction that reaches the majority of nodes first will win b) The transaction that was broadcast first will win c) The miner who finds the next block will likely resolve the tie by including one of the transactions in the block d) Each node has its own version of the block chain containing the transaction that it heard about first