Federal regulations require that additional safeguards have been included in a study to protect the rights and welfare of these subjects: a. children, prisoners, women of child bearing potential, or cognitively impaired persons of any ageb. children, prisoners, individuals with impaired decision-making capacity, or economically or educationally disadvantaged personsc. children, prisoners, pregnant women, or older adultsd. children, prisoners, pregnant women, fetuses, embryos or senior citizens supported by social security benefits