下列属于二阶齐次线性差分方程的是() A. <br/> <img src="https://static.zxtiku.com/wangke/imgs/topic/a0c61542f45c40ec5420584164345502.jpg"/> B. <br/> <img src="https://static.zxtiku.com/wangke/imgs/topic/486e1f09e2435167817cf80fb23ecddd.jpg"/> C. <br/> <img src="https://static.zxtiku.com/wangke/imgs/topic/72c40f24e83fff117ed01480505ec40a.jpg"/> D. <br/> <img src="https://static.zxtiku.com/wangke/imgs/topic/94eb28a55806093d3c75a311286c23b7.jpg"/>