Wassim Masood Has Been the Webmaster for Woori Finance Only

Wassim Masood has been the webmaster for Woori Finance only ten days when he received an e-mail that threatened to shut down Woori's website unless Wassim wired payment to an account in South America.Wassim was concerned that Woori Finance would suffer huge losses if its website went down,so he wired money to the appropriate account.The author of the e-mail successfully committed

A) a denial-of-service attack.
B) Internet terrorism.
C) hacking.
D) cyber-extortion.