In what way(s) can Ethereum Smart Contract functions be invoked?

In what way(s) can Ethereum Smart Contract functions be invoked?
A . Only through code executed in other Smart Contracts and XML-RPC
B . Through code executed in other Smart Contracts and through web3.js or any JSON-RPC library
C . Only through code executed in another Smart Contract
D . Smart Contracts cannot be externally invoked. They become autonomous at launch and cannot be called.

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Answer: B