What part of a packet gets modified as part of a header manipulation attack?

 What part of a packet gets modified as part of a header manipulation attack?

• Flags
• Buffers
• Signature definitions
• Databases

EXPLANATION

Flags = Correct

A header manipulation modifies flags and data in a packet and can launch a session hijacking attack.
Buffer overflow attacks can modify memory buffers.
SQL injection attacks can modify databases.
Antivirus software requires up-to-date signature definitions, but header manipulation does not modify these.

SOURCE

http://www.chegg.com/homework-help/create-http-header-http-headers-originate-web-browser-attack-chapter-3-problem-6hp-solution-9781305480858-exc