Network Address Translation $($NAT$)$ translates the IP address in an IP packet header into another IP address. Which of the following is not an advantage of NAT? A$.$ Effectively preventing attacks from external networks and greatly improving network security B$.$ Implementing accurate identification and control of packet flows on networks to control network access behavior, prevent network attacks, and improve network bandwidth efficiency C$.$ Alleviating the exhaustion of IP$.$ addresses D$.$ Allowing the access of intranet hosts to external networks and the access of external hosts to intranets, and enabling communication between intranets and externalnetworks