You are a project manager for residential construction. As a project manager, you must be especially concerned with building codes particularly in the quality planning process. You must ensure that building codes are reflected in your project plans because ______ .
选项：

A:A) standards and regulations are an input to quality planning
B:B) quality audits serve to ensure there is compliance with regulations
C:C) they are a cost associated with quality initiatives
D:D) compliance with standards is the primary objective of quality control