_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$?

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