创建单线程线程池的是？

创建单线程线程池的是？

A.ExecutorService sTdPool = Executors.newSingleThreadExecutor();

B.ExecutorService fTdPool = Executors.newFixedThreadPool(nThreads);

C.ExecutorService cTdPool = Executors. newCachedThreadPool();

D.ExecutorService schdTdPool = Executors.newScheduledThreadPool(corePoolSize);

正确答案是A