Security Functions or Characteristics of Digital Signatures Include Each of the Following

Security functions or characteristics of digital signatures include each of the following except:

A) A digital signature is the electronic equivalent of a personal signature, which can be forged.
B) Digital signatures are based on public keys for authenticating the identity of the sender of a message or document.
C) Digital signatures ensure that the original content of an electronic message or document is unchanged.
D) Digital signatures are portable.