The terms 'Ethereum, Solana, Polkadot and Tether', sometimes mentioned in the news, refer to

  1. A. Cryptocurrencies
  2. B. Earth Observation Satellites
  3. C. Hypersonic Cruise Missiles
  4. D. Virtual Private Network service providers

Correct Answer: A. Cryptocurrencies

Explanation

Ethereum, Solana, Polkadot, and Tether are well-known cryptocurrencies that function as digital assets using decentralized blockchain technology.

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