想要每两个小时输出“haveabreaknow”到test.txt文本中，如下那个写法是正确的的？

A.02***echo"Haveabreaknow.">>/tmp/test.txt

B.0*2**echo"Haveabreaknow.">>/tmp/test.txt

C.0*/2***echo"Haveabreaknow.">>/tmp/test.txt

D.20***echo"Haveabreaknow.">>/tmp/test.txt

正确答案：0*/2***echo"Haveabreaknow.">>/tmp/test.txt