Which of the following options is wrong for the description of the cleaning center?

The cleaning center completes the functions of drainage, cleaning, and re-injection of the flow after cleaning in the abnormal flow.

There are two types of drainage methods: static drainage and dynamic drainage.

Re-injection methods include: policy route re-injection, static route re-injection, VVPN back-injection and layer 2 same.

The cleaning equipment supports rich and flexible attack prevention technologies, but it is ineffective against cc attacks and ICMP Flood attacks.