What Security Risk Could Be Posed by a Botnet Large

Multiple Choice

What security risk could be posed by a botnet large enough to hold a few million zombie computers?

A) Restricting communication between approved entities
B) Crippling a substantially sized network by withholding critical information like passwords
C) Organizing an underworld market dealing in trade of stolen information
D) Stealing critical information like social security numbers, or revenue records
E) Sending spam mail from thousands of difficult-to-shut-down accounts