Which statement is true when ICMP echo and echo-reply are disabled on edge devices？（）
- APings are allowed only to specific devices.
- BCDP information is not exchanged.
- CPort scans can no longer be run.
- DSome network diagnostic data is lost.
- EWireless devices need to be physically connected to the edge device.
- FOSPF routing needs the command ip ospf network non-broadcast enabled.