The Schuyler and Livingston Iron Works has been working on getting its network security undercontrol. It has set up VPN with IPSec links to its suppliers. It has installed network vulnerabilityscanners to proactively identify areas of weakness， and it monitors and responds to securityevents as they occur. It also employs extensive access control lists， stateful firewall implementations， and dedicated firewall appliances. The company has been growing very fastlately and wants to make sure it is up to date on security measures. Which two areas of securitywould you advise the company to strengthen？ （）

A. intrusion protection
B. identity
C. secure connectivity
D. security management