Group 1 - The core viewpoint of the article discusses whether retail investors can short-sell using over-the-counter (OTC) options, highlighting that while theoretically possible, practical barriers exist for retail participation [1][4]. Group 2 - OTC options are characterized by non-standardized contracts negotiated directly between parties, offering high flexibility but also high entry barriers primarily aimed at institutional investors [4][7]. - Retail investors can theoretically short-sell by buying put options or selling call options, but face significant practical limitations such as qualification requirements and high transaction costs [7][8]. Group 3 - Qualification requirements for retail investors include having a net asset of at least 50 million yuan and financial assets of at least 20 million yuan, along with three years of investment experience [8]. - Domestic regulations impose additional restrictions, with retail investors needing to meet the "532 criteria," while overseas platforms may offer OTC options but come with regulatory and currency risks [8]. Group 4 - Alternative methods for retail investors to short-sell include margin trading, index futures, standardized exchange options, and short-selling ETFs or funds, each with its own set of requirements and risks [8].