According to the code of Manu, what are Shudras?
a. they are the priests and academics. Concerned with teaching, studying, sacrafice, giving and accpeting gifts
b. they are rulers, military, warriors. Concerned with protection of the people
c. they are farmers, landlords, merchants, and traders. Concerned with protection of cattle, charity, lending, agriculture
d. they are peasants, servants, and workers in non-polluting jobs. Concerned with manual work and service without envy of the above three castes