System Analysis and Design
System prototyping helps the designer in

making the programmers understand how the system will function.
all of the listed here
communicating to the user, quickly, how the system, when developed, will look like and get a feedback.
giving a demo of the software, to the system manager to whom he reports

ANSWER DOWNLOAD EXAMIANS APP

System Analysis and Design
Data Definition Language (DDL)

describes how data are structured in the data base
determine how data must be structured to produce the user's view
all of the listed here
specifies for the DBMS what is required; the techniques used to process data

ANSWER DOWNLOAD EXAMIANS APP