It is recommended in the passage as a security measure that people should ______.

A．employees will keep up with security polices and awareness if they are highly-trained
B．the rate of security attacks appears faster than the growth of the Internet
C．one's computer system will always be secure
D．vulnerabilities cannot go through phones, wireless devices

A．New vulnerabilities will be introduced into your environment every day.
B．The manager educates employees about properly configuring firewalls and intrusion detection systems for their PCs.
C．Managers have more responsibility than ever.
D．Security managers are asked to support increasing degrees of network availability and access.