University library information system's;

a. Draw a level 1 data flow diagram of the university library information system. (Hint: Use a single sheet and label each data item clearly.)

b. Explode one of the processes in your original data flow diagram into subprocesses, adding data flows and data stores. (For university library information system)

c. List the parts of the university library information system's process that are hidden to the outside observer and about which you have had to make assumptions to complete a second-level diagram.