Question: In a cipher, all As in the plaintext have been changed to Ds in the ciphertext and all Ds in the plaintext have been changed

In a cipher, all As in the plaintext have been changed to Ds in the ciphertext and all Ds in the plaintext have been changed to Hs in the ciphertext. Is this a monoalphabetic or polyalphabetic substitution cipher? Explain.

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