Spyware and other forms of malware are the biggest online threat to your computer's （） nowadays. These malicious （） which get to your PC through freeware, shareware, commercial sites, deceptive pop-ups or in any other way, can record your surfing habits and sites you visit, share your personal information with their partners. Any personal （）, when in wrong hands, can leave you a victim of an "identity theft" by steeling your credit （）details, birth records and other （） information.
Spyware and other forms of malware are the biggest online threat to your computer's （） nowadays.
A. reliability
B. security
C. capability
D. efficiency