How does a valid digital signature assure the recipient that the document has not been tampered with?
Select one:
a. The digital signature was encrypted using the recipient's public key
b. The hash contained in the digital signature was encrypted with the sender's private key and could not have been modified without making the signature invalid. If the signature is valid, then the data must not have been tampered with.
c. The digital signature is transmitted in a separate message from the document
d. A valid digital signature cannot assure the recipient the document has not been tampered with
