An Intrusion-Detection System Detecting a Series of ICMP Packets Sent

Multiple Choice

An intrusion-detection system detecting a series of ICMP packets sent to each port from the same IP address might indicate:

A) a Distributed Denial of Service attack in progress
B) scanning of the system for vulnerabilities prior to an attack
C) the system has been infiltrated by an outsider
D) Trojan horse\virus infection sending information back home