Which of the following statements are true about penetrance and expressivity? Please make sure to select all correct answer options.Question 14 options: a. Expressivity measures the severity of the phenotype. b. Incomplete penetrance and variable expressivity cannot cooccur for a given allele. c. Penetrance and expressivity of a given allele is affected by both environmental factors and genetic backgrounds of different individuals. d. Penetrance describes the extent to which individuals with a given allele exhibit the phenotype associated with that allele.