Which of the following statements about blockchain are correct?
A) A transaction is accepted once it is included in some block.
B) A transaction is accepted once it is included in a block that is at least 6 blocks deep.
C) The number of leading zeros required for the hash value of a block is dynamically changing over time.
D) A miner gets a reward whenever it finds a block that hashes to a value with required number of leading zeros.
E) Consensus is achieved by proof of work and the longest chain rule.
B - I came to know from Wikipedia
I know the D,E are correct but I'm not sure about the B. Can you please tell me if my above options are correct or not.