單項(xiàng)選擇題

下列創(chuàng)建線程的方法中,屬于在后臺(tái)創(chuàng)建線程的是()。

A.-(instancetype)initWithTarget:(id)target selector:(SEL)selector object:(id)argument
B.+(void)detachNewThreadSelector:(SEL)selector to Target:(id)target with Object:(id)argument;
C.-(void)performSelectorInBackground:(SEL)aSelector withObject:(id)arg;正
D.+(NSThread*)mainThread;

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