The correct option is
D All of the above
Genetic counsellors are associated with a prenatal and postnatal diagnosis. He performs various methods such as amniocentesis, ultrasound and karyotyping to determine the congenital disorder, sex determination and chromosomal abnormalities of the foetus. They also discuss family planning with couples and guide them regarding the same. They also tell the status of the fetus, with the intent of aborting a fetus affected by the genetic disorder and selecting the foetus without chromosomal abnormalities. Thus, the correct answer is option D.