Jagged Array

Task description

• Implement a OrderByAscendingBySum extension method that orders the rows in a jagged-array by ascending of the sum of the elements in them.
• Implement a OrderByDescendingBySum extension method that orders the rows in a jagged-array by descending of the sum of the elements in them.
• Implement a OrderByAscendingByMax extension method that orders the rows in a jagged-array by ascending of the maximum of the elements in them.
• Implement a OrderByDescendingByMax extension method that orders the rows in a jagged-array by descending of the maximum of the elements in them.
  The task definitions are given in the XML-comments for this methods.
  Restriction: use only the capabilities of the C# language.