The diagonals of parallelogram JKLM intersect at point Z. Which statement is true?
1) The diagonals of parallelogram JKLM are perpendicular to each other.
2) The diagonals of parallelogram JKLM are equal in length.
3) The diagonals of parallelogram JKLM bisect each other.
4) The diagonals of parallelogram JKLM are parallel to each other.