Immunosupressive effect of glucocorticoids is caused by:

a) Reducing concentration of lymphocytes (T and B cells) and inhibiting function of tissue macrophages and other antigen-presenting cells

b) Suppression of cyclooxygenase II expression which results in reducing amount of an enzyme available to produce prostoglandins

c) Activation of phospholipase A2 and reducing prostaglandin and leukotriene synthesis.

d) All of the above