[Solved] All of the following are true regarding IgM's EXCEPT which one? A) They have a short half-life. B) They are the first to be synthesized after antigenic stimulation. C) They cross the placenta. D) They are present mainly in plasma. E) They consist of several subunits. Controlling the Assault of Non-Solicited Pornography and Marketing Act: A law enacted to protect individuals from unsolicited commercial email and pornography by establishing rules for commercial email, including requirements for unsolicited messages and penalties for violations. Commercial E-Mail Messages: Electronic mail messages whose primary purpose is the commercial advertisement or promotion of a commercial product or service. FTC: The Federal Trade Commission, a US federal agency aimed at preventing anticompetitive, deceptive, and unfair business practices. Consumer Harm: Negative impacts experienced by consumers due to unethical business practices, defective products, or fraudulent activities.