Ethereum contracts doesn't serve which purpose? $(6$ pt$)$

A$.$ Manage contract or relationship between untrusting users

B$.$ Provide functions to other contracts

C$.$ Store and maintain data

D$.$ Taking part as a control mechanism.

What is Ethereum Virtual Machine? $(6$ pt$)$

A$.$ Central Controller

B$.$ Coding standard for Fthereum

C$.$ Ethereum programming language

D$.$ "Mini computer" that runs contract code

In solidity language; "contract" declaration has similarities to

A$.$ Function

B$.$ Class in other languages $($like Java$)(6$ pt$)$

C$.$ Variable

D$.$ Integer

Storage is expensive because it is $.......$ in solidity. $(6pt$

A$.$ Easy to read

B$.$ Permanent

C$.$ Computer requirements

D$.$ Secure

What is the main goal of distributed system? $(6$ pt$)$

A$.$ All components agree on the system's state $-$ reaching a consensus

B$.$ Centralized management of data

C$.$ Encrypting the data on the network

D$.$ Reduction of storage space

To ensure correctness, one uses a consensus algorithm achieving the following: Validity, Agreement, and $(6pt)$

A$.$ Termination

B$.$ Sustainability

C$.$ Continuity

D$.$ Security

Which of them is not a consensus method $(6$ pt$)$

A$.$ Proof of Burn

B$.$ Proof of Space

C$.$ Proof of Byzantine

D$.$ Proof of Elapsed Time

Which of them doesn't provide an infrastructure to build your own smart contracts $(6pt$

A$.$ Bitcoin

B$.$ Ethereum

C$.$ Corda

D$.$ Hyperledger

DON'T FORGET TO CODE YOUR ANSWERS BELOW