subject software design and architecture

a) Suggest a design pattern for the given scenarioand also draw class diagram.

We are considering a business caseof pizza-hut where we can get differentvarieties of pizza and cold-drink.

Pizza can be either a Veg pizza or non-Vegpizza of several types (like cheese pizza, onion pizza,masala-pizza etc) and will be of 4 sizes i.e. small, medium, large,extra-large.

Cold-drink can be of several types (likePepsi, Coke, Dew, Sprite, Fanta, Maaza, Limca, Thums-up etc.) andwill be of 3 sizes small, medium, large.

b) Yasir is admin of LMS for xyz university. He needs to be loginonce and whenever a new form of software is open on his system hewants his same ID opened on that page. Suggest a design pattern forhis problem. Also provide code for the solution of thisproblem.