Final answer:
The best choice for Carter Vacuums would be structured interviews, cognitive ability tests, and work samples.
Step-by-step explanation:
The best choice for Carter Vacuums to minimize costs while ensuring a highly valid assessment method for their hiring process would be structured interviews, cognitive ability tests, and work samples.
Structured interviews allow for standardized questions that directly relate to the job requirements, ensuring consistency and validity in the selection process. Cognitive ability tests assess the candidates' mental abilities, which are highly relevant to the specific job requirements. Work samples, on the other hand, provide a realistic demonstration of the candidates' skills and abilities in performing actual job tasks.