What is the difference between Proof−$-$of−$-$Stake and Proof−$-$of−$-$Work?

a.$.$

PoW is Consensus algorithm while PoS is Consensus Mechanism

b.$.$

PoW is used for security while PoS is used for privacy

c.$.$

PoW used for data hiding while PoS is used for data cleaning

d.$.$

PoW is used in financial transactions while PoS is used in computer network