Positive punishment means that when an individual issues a certain behavior, it triggers some external response to its behavior, which leads to unpleasant consequences for the individual and reduces the possibility of the individual's future behavior. Negative punishment refers to when the individual issues a certain behavior. After the behavior, the revocation has a pleasant effect on the individual, making the individual less likely to initiate this behavior in the future. According to the above definition, which of the following is penalties? ['Significantly fewer people smoke in the office after the no-smoking sign.', 'Mother asks Xiaoming not to go out without writing homework.', 'No one drunk after being punished for drunk driving.', 'Popsicles relieve the heat, so summer popsicles are very popular.']