Harbour works: identify the correct statements—(a) an artificial barrier creating a sheltered anchorage is a breakwater; (b) a breakwater whose inside is used as a platform for cargo handling is a mole; (c) the length of a quay wall is governed by the length of the largest vessel likely to be berthed (per-berth planning).

Introduction / Context:
Terminology and dimensioning principles in harbour engineering inform preliminary planning and cost estimation. Understanding what constitutes a breakwater or mole and how berth length relates to vessel size is essential.

Given Data / Assumptions:

• Protective works create calm basins for anchorage and operations.
• Working surfaces on the harbour side of a breakwater are termed moles.
• Quay-wall length per berth is related to target vessel length plus allowances for clearance and mooring.

Concept / Approach:
(a) Breakwaters shield the basin from waves. (b) When equipped for operations, the interior side functions as a mole. (c) For berth design, the required face length is pegged to the largest design vessel (LOA) with additional clearance; overall quay length for multiple berths scales with traffic and number of berths.

Step-by-Step Solution:
Verify (a) and (b): Standard definitions.Verify (c): Per-berth face length is governed by vessel size; aggregate quay length depends on the number of planned berths.Hence, all three statements are acceptable.

Verification / Alternative check:
Harbour planning manuals state berth length ≈ LOA + clearance; moles and breakwaters defined as above.

Why Other Options Are Wrong:

• Choosing fewer than all omits accepted planning principles and definitions.

Common Pitfalls:

• Confusing overall quay length (multiple berths) with per-berth face length.

Final Answer:
All the above.