The pseudonymous name used by the person or persons who developed Bitcoin and launched it in 2009 is "Satoshi Nakamoto".
Answer: Option A
Explanation:
Satoshi Nakamoto launched the 0.1 Version of the top bitcoin software on Sourceforge, followed by the first units of the bitcoin cryptocurrency popular as "bitcoins" on 9th January 2009. He published a paper titled as "Bitcoin: A Peer-to-Peer Electronic Cash System" on October 2008 which illustrated the digital currency of bitcoin.
In the meantime Nakamoto was the first to use a peer-to-peer network to address the double-spending question for digital currency. Nakamoto had been involved in bitcoin production up to December 2010.
