A number n is called a perfect cube if there exists.

• A.  a natural number m such that n \[=m\times m\]
• B.  a natural number m such that \[m=n\times m\times n\]
• C.  a natural number m such that \[n=m\times m\times m\]
• D.  a natural number m such that \[m=n+m+n\]