下列函数中为奇函数的是( ).<br/> A、<img src="https://static.zxtiku.com/wangke/imgs/topic/43a4af59e754595c41992a1f68a987ae.jpg"/><br/> B、 <img src="https://static.zxtiku.com/wangke/imgs/topic/3b42effc8f008026f993abde419055e2.jpg"/><br/> C、y=<img src="https://static.zxtiku.com/wangke/imgs/topic/ad113652c168937cd595811604803aaf.jpg"/><br/> D、<img src="https://static.zxtiku.com/wangke/imgs/topic/cb27d88ba50bf6c920d17712de6d1131.jpg"/>