A sequence of bits appended to a digital document that is used to secure an e-mail sent through
the Internet is called a:

A.
digest signature.

B.
electronic signature.

C.
digital signature.

D.
hash signature.

Explanation:
A digital signature through the private cryptographic key authenticates a transmission from a sender
through the private cryptographic key. It is a string of bits that uniquely represent another string of
bits, a digital document. An electronic signature refers to the string of bits that digitally represents
a handwritten signature captured by a computer system when a human applies it on an electronic
pen pad, connected to the system.