Which of the following is a true statement about the effects of stis on one's health? a. in addition to the emotional trauma that an sti can cause, a person can suffer great mental disability as a result of an sti. b. the physical effects of an sti can be easily hidden because they generally only affect the genital area. c. if there are no symptoms of the sti, the person can still donate blood because the blood is only rarely affected. d. all of the above