Regarding complexity of the circulatory system in animals: 1. open type - blood is pumped out of the heart and the cells and tissues are directly bathed in it 2. closed type - blood is circulated through a series of vessels of varying diameters (arteries, veins and capillaries).

Question

( a ) Both are incorrect
( b ) 1 is incorrect but 2 is correct
( c ) 1 is correct but 2 is incorrect
( d ) Both are correct