Which of the following is not one of the principles of corporate public relations that a company should follow

a. to make sure management thoughtfully analyzes its overall relation to the public
b. to create a system for informing all employees about the (company's) general policies and practices
c. to ensure secrecy and security regarding the company's actions
d. to create a system giving contact employees (those having direct dealings with the public) the knowledge needed to be reasonable and polite to the public
e. to create a system drawing employee and public questions and criticism back up through the organization to management