Weather, Climate and Adaptation of Animals to Climate

Given below are some adaptive features of animals:
(i) Layer of fat under the skin
(ii) Long, curved and sharp claws
(iii) Slippery body
(iv) Thick white fur
Which of them are the adaptive features of a polar bear?
(a) (i) only (b) (i) and (ii) only
(c) (i), (ii) and (iii) only (d) (i), (ii), and (iv) only