A. Observers attach object IDs to traffic
This is incorrect. Packet classification and object identification occur within the firewall kernel during the initial stages of packet inspection, not by the Observer process.
B. They store Rule Base matching state related information
This is incorrect. State-related information for traffic matching the Rule Base is maintained in the kernel's connection tables (state tables), not by the Observer.
D. Observers decide whether or not to publish a CLOB to the Security Policy
This is incorrect. The process of compiling and publishing a policy (CLOB - Compiled Loadable Object Block) is managed by the FWM process on the Security Management Server and the CPD process on the gateway.