There are many reasons why customers lack sufficient security measures on the network. Which two reasons for insufficient security are typical of the customers today?（）

A、A.the use of hosted email services eliminating the need for local security

B、B.the perceived costs of security solutions

C、C.the lack of risk analysis

D、D.the lack of threats to their network

E、E.the belief that free security tools are sufficient

F、F.the desire to avoid unnecessary technologies