mcq conceptual based thy . Kuch Kuch handout se b thy , but files may se aik b nhi aya tha Question : three type of transactional functions. level 0 Dfd diagram of railway cutomer service system , two external entities passenger and Assistant. list given thi btana tha in may knsa actor nhi ha Coad's methodology. 4 mandatory aspects for the existence of object that make obj instance of class.