Which of the following are TRUE about Gas as relating to blockchain technology?

It is used on the Bitcoin blockchain to pay for transaction fees.

It is usually denominated in gwei.

Gas refers to a unit that measures the amount of computational effort required to execute specific operations on the Ethereum network $-$ such as executing a smart contract that automatically sends another a certain amount of Ether $($ETH$.)$

It is usually denominated in Satoshi.

It is needed to power smart contracts and transactions on the Ethereum blockchain. When creating a self$-$executing smart contract, you should always make sure there are sufficient funds for gas to power the smart contract.