A particular type of malware labeled "Code Red" attacked in 2001. The following three things were its instructions: duplicate itself for the beginning twenty days of each month; change/replace web pages on infected servers with a page featuring a message; and launch a concerted attack on the White House website in an attempt to overwhelm it. Based on these behaviors, the "Code Red" program belongs to which category of malware? A. Spyware B. Worms C. Viruses D. Trojan horse