Final answer:
The credibility of Mr. Rutland can be established through his education, job, community involvement, and research on the subject.
Step-by-step explanation:
The credibility of Mr. Rutland can be established through various factors. First, he refers to himself, his education, and his job, which indicates expertise in a certain field. Second, his involvement in the community as a parent and concerned resident adds to his credibility. Lastly, his statement about researching the subject shows a commitment to thoroughness and accuracy.