Since Ethereum's smart contracts are conceptually superior to Bitcoin's contracts, why have Ethereum's smart contracts not become more popular?

Multiple Choice

1. Ethereum's smart contracts are too complicated to be readily understood by many traders.

2. All the above are true.

3. The infrastructure needed to confirm the required condition or conditions in Ethereum's smart contracts is still nascent.

4. Not all PCs are capable of evaluating the conditions required in Ethereum's smart contracts.

5. Ethereum's smart contracts are error prone.