True or false.

a. In software development, the major portion of human effort is concentrated in the

phase of manufacturing a developed product.

b. Risk analysis is one of the main characteristics of prototype based development

paradigm

c. Models require the availability of standard notations for modeling, documenting, and

communicating decisions

d. Entity relationship diagrams are well suited to the task of modeling concurrent

proceses

e. Management prefers that the development follows the waterfall model because it

appears to be predictable and well understood.