What is a letter of comments?

  a. A letter the SEC sends to a company indicating needed changes or clarifications in a registration statement.
  b. A questionnaire supplied to the SEC by a company suggesting changes in Regulation S–X.
  c. A letter included in a Form 10–K to indicate the management’s assessment of the company’s financial position.
  d. A letter composed by a company asking for information or clarification prior to the filing of a registration statement.