Cryptographic key

Grace would like to send a message to Joe using digital signature technology. What cryptographic key should she use to create the digital signature? a. Grace’s public key b. Grace’s private key c. Joe’s public key d. Joe’s private key Joe received a digitally signed message from Grace. What cryptographic key should he use to verify the digital signature? a. Grace’s public key b. Grace’s private key c. Joe’s public key d. Joe’s private key

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