Create a context diagram DFD Level $0$ for the following high$-$level requirements in a housing system

run by the Campus Housing Service. The Campus Housing Service helps student find apartments.

Owners of apartments fill in information forms about the rental units they have available $($e$.$g$.,$

location, number of bedrooms, monthly rent$),$ which are entered into a database.

Students can search through this database via the web to find apartments that meet their

needs $($e$.$g$.,$ a two$-$bedroom apartment for $$800$ or less per month within half a mile of

campus$).$

They then contact the apartment owners directly to see the apartment and possibly rent it$.$

Apartment owners call the service to delete their listing when they have rented their

apartment$($s$).$

Wow Pizza wants to install a system to record orders for pizza and chicken wings. When regular

customers call Wow Pizza on the phone, they are asked their phone number. When the number

is typed into a computer, the name, address, and last order date is automatically brought up on

the screen. Once the order is taken, the total, including tax and delivery, is calculated. Then the

order is given to the cook. A receipt is printed. Occasionally, special offers $($coupons$)$ are printed

so the customer can get a discount. Drivers who make deliveries give customers a copy of the

receipt and a coupon $($if any$).$ Weekly totals are kept for comparison with last year's performance.

Draw Context Diagram and Context Diagram Level $0$ for your project.