O Which of the following statements about disability income insurance is true? a. Typical probationary periods for disability insurance range from 90 days to a year. OOO 00 b. Policies with a guaranteed renewability provision are generally more expensive initially than noncancelable policies. c. Most individual disability income policies pay a fixed percentage of gross income. d. Any disability stemming from an illness or injury that occurs during the probationary period is covered. from 30 days to a year. e. Typical waiting periods for disability insurance range