Which of the following is not an example of the unfair marketing practice known as sliding? a. persuading an applicant for insurance that an additional product or policy feature is required by law when it is not b. telling the applicant that an additional product or policy feature is included at no additional cost when there is actually an additional charge c. offering an applicant a waiver of premium rider because he works in a dangerous job d. adding an additional product or policy provision and charging the policyholder without obtaining the policyholder's consent