What is odd about this attack?

Snort has been used to capture packets on the network. On studying the packets, the penetration tester finds it to be abnormal. If you were the penetration tester, why would you find this abnormal?

(Note: The student is being tested on concept learnt during passive OS fingerprinting, basic TCP/IP connection concepts and the ability to read packet signatures from a sniff dumo.)

05/20-17:06:45.061034 192.160.13.4:31337 -> 172.16.1.101:1

TCP TTL:44 TOS:0x10 ID:242

***FRP** Seq: 0XA1D95 Ack: 0x53 Win: 0x400

05/20-17:06:58.685879 192.160.13.4:31337 -> 172.16.1.101:1024

TCP TTL:44 TOS:0x10 ID:242

***FRP** Seg: 0XA1D95 Ack: 0x53 Win: 0x400

What is odd about this attack? (Choose the most appropriate statement)

A.
This is not a spoofed packet as the IP stack has increasing numbers for the three flags.

B.
This is back orifice activity as the scan comes from port 31337.

C.
The attacker wants to avoid creating a sub-carrier connection that is not normally valid.

D.
There packets were created by a tool; they were not created by a standard IP stack.

Explanation:
Port 31337 is normally used by Back Orifice. Note that 31337 is hackers spelling of `elite’, meaning `elite hackers’.