What is correct about digital signatures?

What is correct about digital signatures?
A . A digital signature cannot be moved from one signed document to another because it is the hash of the original document encrypted with the private key of the signing party
B . Digital signatures maybe used in different documents of the same type.
C . A digital signature cannot be moved from one signed document to another because it is a plain hash of the document content.
D . Digital signatures are issued once for each user and can be used everywhere until they expire.

View Answer

Answer: A