Concept:A prospectus is an official invitation for the public to buy shares in a company.Explanation:A company issues a prospectus when it wants to raise capital from the public.The document contains important information about the company and its business.It invites investors to apply for or subscribe to the company's shares.This is not a call to register or liquidate the company.It also does not involve redeeming outstanding shares.Therefore, the purpose is to secure share subscription from the public.Answer:D. subscribe for share.