Which ascept are incorprated in the concept of development

not sure if this helps but. Concept development is a set of activities that are carried out early in the systems engineering life cycle to collect and prioritize operational needs and challenges, develop alternative concepts to meet the needs, and select a preferred one as the basis for subsequent system or capability development

report them to the principal and if they dont do anything about it get your parents involved and keep reporting the teacher.

answer(d) call 911;