please help withanswer to this question

What is NOT an advantage of using a thread pool to implement a multithreaded application?

a. A thread pool limits the total number of threads that exist at one point.

b. The thread pool size can be adjusted based on demand from concurrent request.

c. Threads in the pool share a common request queue that requires synchronized acess.

d. Uisng an existing thread to service a request takes less time than waiting to create a new thread.