Which of the following costs should be included in calculating the value of the inventory of a manufacturer?

(i) Carriage outwards

(ii) Carriage inwards

(iii) Salespersons’ salaries

(iv) Factory equipment hire

(a) (i) and (iv) only

(b) (i), Gi) and (iv) only

(c) All of them

(d) (ii) and (iv) only