Using the case study in question $3\mathrm{.}1$ above Implement the following:

a$.$ Define a delegate and event to notify when an item is added to the cart.

b$.$ Define a delegate and event to notify when a discount is applied to an item.

c$.$ Main Method with the following:

$$ Instantiate the ShoppingCart and Product objects.

$$ Subscribe to the events for item addition and discount application.

$$ Create Products

$$ Add Products to Cart $($Trigger the appropriate event$)$

$$ Display Cart Items and Cart Total $($Before Discounts$)$

$$ Apply Discounts on Cart Items Based on Category $($Trigger the appropriate event$)$

$$ Display Cart Items and Cart Total $($After Discounts$)$

$(25$ marks$)$