The correct option is D All of the above
Spleen is the largest lymphatic organ in the body. The spleen consists of two types of tissue called white pulp and red pulp. Unlike white pulp, which mainly contains lymphocytes such as T cells, red pulp is made up of several different types of blood cells, including platelets, granulocytes, red blood cells, and plasma. In spleen, the cords of Billroth is present in the red pulp which is composed of connective tissue. Hence, all the options are parts of spleen.