46. Consider the following statements:
Prophylactic disinfection includes
1. disinfection of urine specimen of patient with enteric fever
2. pasteurization of milk
3. disinfection of contaminated linen
4. disinfection of water by chlorine
Which of these statements are correct?
(a) 1, 2, 3 and 4
(b) 2 and 4 only
(c) 1, 2 and 4 only
(d) 1 and 3 only