Tayzia Notices That Her IDS Logs Are Showing Repeated Access

Tayzia notices that her IDS logs are showing repeated access attempts to the $ EXTERNAL_NET toward a range of ports 6662-6667. Luckily, the connections were unsuccessful, what is the bad news?

A) Tayzia will have to work overtime (unpaid, this is IT after all) trying to figure out where all the MP3s are being hid on the network.
B) Clearly someone is using BitTorrent to download the first season of "Star Trek: Deep Space Nine"
C) Something on her network is trying to access IRC, and it might be an infected host.
D) These are common administrative ports for Citrix or Oracle or something. She doesn't remember because during that discussion in her training class she was answering an email instead of listening. Either way, there is no need to investigate; it is probably just a false positive.