Consider the following statements:
Statement $1$: If a quadrilateral is a square,then all of its sides are equal.
Statement $2$: If all the sides of a quadrilateral are equal,then it is a square.

• A
  Statement $2$ is the contrapositive of statement $1$.
• B
  Statement $2$ is the negation of statement $1$.
• C
  Statement $2$ is the inverse of statement $1$.
• D
  Statement $2$ is the converse of statement $1$.