To communicate that a document is using a digital signature, which one of the following is the next step in the process after a hash of the document is calculated by the sender?

To communicate that a document is using a digital signature, which one of the following is the next step in the process after a hash of the document is calculated by the sender?
A . The hash is appended to the end of the document.
B . The hash is stored by the sender.
C . The hash is encrypted using the private key of the sender.
D . The hash is encrypted using a symmetric encryption algorithm.
E . The hash is signed using the public key of the receiver.

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Answer: C