Accepting unsolicited sell orders from customers while participating in a distribution is not, by itself, a violation of the anti-manipulation provisions. The key word is “unsolicited.” Regulation M and related anti-manipulation rules restrict distribution participants from conduct that could artificially condition or influence the market for a security being distributed. However, processing unsolicited customer sell orders does not represent the firm inducing demand, supporting the market, or manipulating the price. Choice D is therefore the exception. Short tendering is prohibited because it can distort tender offer mechanics by allowing a person to tender shares not properly owned. Stabilizing above the offering price is improper because stabilization, when permitted, must follow strict limits and cannot be used to push the market above the offering level. Distributing research while participating in an IPO can improperly condition the market and raise serious conflict and promotional concerns. The SIE outline includes market manipulation, Regulation M, deceptive practices, IPO-related restrictions, and prohibited activities. This question tests recognition of conduct that manipulates distribution markets versus ordinary unsolicited customer order handling. Reference: Section 3.3.1 Market Manipulation; Regulation M.