Social Networks and Cloud Computing Have Increased Vulnerabilities in All

Social networks and cloud computing have increased vulnerabilities in all of the following ways except ________.

A) by providing a single point of failure and attack for organized criminal networks
B) In Twitter and Facebook,users invite in and build relationships with others.Cybercriminals hack into these trusted relationships using stolen logins.
C) Twitter's use of service packs and patches have not been effective.
D) These networks and services increase exposure to risk because of the time-to-exploitation of today's sophisticated spyware and mobile viruses