what happens during the quarantine phase of the worm mitigation?

According to SAFE worm mitigation, what happens during the quarantine phase of the worm mitigation?

A.
All uninfected systems are patched with the appropriate vendor patch for the vulnerability.

B.
The spread of a worm infection is limited to areas of the network that are already affected.

C.
An actively infected system is disinfected of the worm.

D.
Infected machines are identified, contained, and blocked.