Trust protection principle is a basic principle of administrative law, which means that the government should keep its promise to its own behavior or commitment, and should not change at will.
According to the above definition, which of the following violations of the trust protection principle?
The Public Security Bureau of a certain city intends to impose a penalty of revoking the license on Qian, but after investigation, it was confirmed that Qian's behavior was not illegal, so no punishment was imposed