What are the main types of mastitis in cattle and what factors predispose to the disease?

Mastitis is the inflammation of the mammary gland caused mainly by bacteria that penetrate the inner parts of the udder.
Mastitis subclinical is more frequent in milking cows and does not alter the udder, being recognized only through tests performed on milk.
Mastitis clinical is characterized by the enlargement, redness, heat and hardness of the affected quarter or quarters, and the cow affected does not allow milking due to pain.
Incorrect milking practices, lack of hygiene in hands, stables, pens and utensils, and incorrect udder shape are some of the factors that predispose to mastitis.
a) I and II are correct.
b) II and III are correct.
c) I, II, III and IV are correct.
d) I and IV are correct.