Why Might a Kernel-Mode Component Need to Create a System

Multiple Choice

Why might a kernel-mode component need to create a system thread or queue a work item to a system worker thread?

A) The component must perform work not requested by a user thread (e.g., flushing dirty pages to disk) .
B) The component is unable to perform all interrupt processing at an elevated IRQL.
C) The component must share handles with a user-mode process.
D) Both a and b.