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Answer :

Term that doesn't belong to a type of digital signature is Invisible Digital Signature.

What is digital signature?

A digital signature  can be regarded as the  mathematical technique used to validate the authenticity and integrity of a message.

Examples of type of digital signature are:

  • Approval Signatures
  • Non-Certified Signatures
  • Visible Digital Signature

Therefore, option D is correct.

Learn more about digital signature at;

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