以下哪个定时任务可以每天6.9.12.15.18整点查看一下系统当前挂载的所有文件系统，并将查看的结果追加至/tmp/mounts.txt文件中？（)

A.* */3 * * */bin/mount ＞＞/tmp/mounts. txt

B.0 6-18/3 * * */bin/mount ＞＞/tmp/mounts. txt

C.0 6-18 * * */bin/mount ＞＞/tmp/mounts. txt

D.*/3 6-18 * * */bin/mount ＞＞/tmp/mounts. txt