According to the class overheads and basic ethics, which one of the following assertions about insider trading which is against the law, is true? a. Insider trading is legal and should be considered as a potential approach to investing b. Insider trading is legal and should not be considered as a potential approach to investing c. Insider trading is illegal and should be considered as a potential approach to investing d. Insider trading is illegal and should not be considered as a potential approach to investing