Consider the following statements: (a) Portal veins carry blood directly to the heart and forms a network of capillaries. (b) In human beings, two main portal systems; hepatic and the hypophyseal portal systems are present. (c) A pair of hepatic veins carries blood from liver to the inferior vena cava. (d) The blood from intestine, pancreas and spleen is drained into liver via. the hepatic portal vein.

Which of the above statements is/are incorrect about portal system of a man?