Spoofing happens when: a. a word is converted into a digital pattern. b. a firewall rejects the incoming data packets. c. keystrokes are monitored and recorded. d. an illegitimate program poses as a legitimate one.

d. an illegitimate program poses as a legitimate one.

Explanation:

A spoofing occurs when the attacker uses an email message to tricks the recipient into thinking that comes from a know or a trusted source. And is made by use of a dominant alternative letters and numbers as to appear slightly different from the original and is sort of skill. An example is of the email attack.