"Interlocked" class in Silverlight application?

Which of the following operations can be performed by the "Interlocked" class when included in your Silverlight application?


a. It can be used to add an integer value to a variable and return the new value of the variable.
b. It can be used to increment or decrement a variable and return the resulting value.
c. It can perform an atomic exchange of the value in a specified variable, returning that value and replacing it with a new value.
d. It can be used to delete an integer value to a variable and return the new value of the variable.


rajsekhar