The Maximum Harbour Depth Below Lowest Low Water Is Generally

The maximum harbour depth below lowest low water is generally equal to
(i) Loaded draft +1.2 m when bottom is rock
(ii) Loaded draft +1.8 m when bottom is soft
(iii) Loaded draft +1.2 m when bottom is soft
(iv) Loaded draft +1.8 m when bottom is rock
Of these statements

A) (i) and (ii) are correct
B) (i) and (iii) are correct
C) (ii) and (iv) are correct
D) (iii) and (iv) are correct