Question: "Talk includes two testimonials. The first is from a colleague and says, “Communication is a key to a happy marriage and NAME_1 is one of the leading experts on communication. If you feel you just can't talk to your partner, I'd recommend NAME_1’s workshop. It's likely to benefit your relationship."" The second testimonial is from a former workshop participant who said NAME_1 could use an excerpt from a letter she sent him following the workshop that she and her husband attended. It says, “It worked! I can now tell my husband what I need without it turning into a major argument!"" Which of the following is true about the testimonials included in NAME_1’s brochure?"
A: They are clearly unethical.
B: The testimonial from the colleague is unethical but the testimonial from the former client is acceptable.
C: The testimonial from the former client is unethical but the testimonial from the colleague is acceptable.
D: The testimonials do not seem to violate ethical requirements.
Please eliminate two incorrect options first, then think it step by step and choose the most proper one option.