Ethereum, Tether, Solana and Cardano are all forms of

  1. A. Crypto currency
  2. B. Artificial Intelligence(AI) Startups
  3. C. Humanoid Robots
  4. D. Medical apps

Correct Answer: A. Crypto currency

Explanation

Ethereum, Tether, Solana, and Cardano are all well-known examples of digital or virtual currencies, collectively known as cryptocurrencies.

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