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.