| A) 1 only | B) 1 and 2 only | 
| C) 2 and 3 only | D) 1, 2 and 3 | 
Explanation:
Bitcoin is the world's first cryptocurrency, a form of electronic cash.It is the first decentralized digital currency: the system was designed to work without acentral bankor single administrator.Bitcoins are sent from user to user on the peer-to-peer bitcoin network directly, without the need for intermediaries. These transactions are verified by network nodes through cryptography and recorded in a public distributed ledger called a block chain. Bitcoin was invented by an unknown person or group of people using the name Satoshi Nakamoto. Bitcoins are not recognised as a legal tender by Reserve Bank of India.
 
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