1) Available actions: 

• Contains: 

  Checks whether an item is in the queue or not.

• Count: 

  Returns the total count of elements in the Queue.

• Dequeue: 

  Removes and returns an item from the beginning of the queue.

• Enqueue: 

  Adds an item into the queue.

• Peek: 

  Returns an first item from the queue.

• TrimToSize: 

  Sets the capacity of the queue to the actual number of items in the queue.