please help with the answer to this question

What kind of thread cancellation is demonstrated in the threadFun() thread function ?

int done = 0; // global variable // the thread function void* threadFun(void* p) { ... while (! done) { ... // do some work }

pthread_exit(0); }

a.forceful cancellation

b. deferred cancellation

c.loop cancellation

d. asynchronous cancellation