Ethical conduct and professional integrity is the correct choice.

Ethical conduct and professional integrity must be the primary consideration because certified practitioners have a duty to protect people and systems and to maintain public trust when making decisions.

When technical options and legal requirements conflict or when resources are limited the guiding principle should be ethical judgment and professional integrity so that actions do not cause harm even if they are feasible or cheaper.

Cost effective and mindful of budgets is an important operational concern but it is not primary because prioritizing cost can lead to unsafe or unethical outcomes.

Technically accurate and operationally feasible is necessary for implementation but it does not address moral obligations or conflicts of interest and so it cannot be the sole guiding quality.

Compliant with applicable laws and regulations is required and it sets a baseline for behavior but legal compliance alone does not ensure ethical conduct and laws may lag behind professional responsibilities.

Full AWS Practitioner Certification Question