Fill in the blanks in each of the following statements:

a) Use the _________property of the List class to find the number of elements in the List.

b) The LINQ _________clause is used for filtering.

c) _________are classes specifically designed to store groups of objects and provide methods that organize, store and retrieve those objects.

d) To add an element to the end of a List, use the _________method.

e) To get only unique results from a LINQ query, use the _________method.