Which of the following is not true about Proof of Work consensus 3 points mechanism? It is vulnerable to 51% attack. The proof is obtained by solving a puzzle. Miners have to have a bank account for receiving the prize. Anybody can be a miner. In iptables what is the purpose of default policy? 3 points It is the set of rules that are applied to all incoming and outgoing packets. It is a single action that is applied to the packets which do not match any rules in the ruleset. It is the set of rules that are applied to some of incoming and outgoing packets if they match with some rules in the ruleset. Which of the following is not ideological reasons of the movement that lead 3 points to Bitcoin? The public information should not be owned by a central autority Everybody should have means to be rich. Actions of the public should not be used against them. Currency should not be controlled by governments