How do insights from measuring defects per unit $($DPU$)$ differ from those gained by counting defective units?

a$.$ measuring DPU requires more time without providing extra insights compare to simply counting defective units

b$.$ both dpu and counting defective units provide similar insights into production quality

c$.$ DPU provides a more comprehensive understanding of quality issues, offering insights that counting defective units cannot.

d$.$ counting defective units is preferable because this method aligns more directly with overall customer satisfaction

e$.$ DPU is primarily useful during the intial data collection phases and decreases in relevance as production quality stabilizes