Which of the Following About Solicited Proposals Is True

Which of the following about solicited proposals is true?

A) Solicitation may come in the form of an indirect verbal or written request.
B) Normally solicitations are direct,closed-bid to the public,and informally published.
C) They require a thorough understanding of the market,product and/or service,and their presentation is typically general.
D) They are often regarded as marketing materials,intended more to stimulate interest for a follow-up contact than make direct sales.
E) If you have been asked to submit a proposal it is considered solicited.