Harbour engineering basics: identify the correct statements — (a) a harbour without any port complex is called a refuge harbour; (b) a harbour used primarily for fishery operations is called a fishery harbour; (c) the terminal building of a commercial harbour typically includes an administrative block, customs clearance facilities, and warehouses.

Introduction / Context:
Coastal and harbour engineering uses precise terminology to distinguish types of harbours and their functional components. Understanding these names is essential for planning, estimating, and interpreting port layout drawings and tender documents.

Given Data / Assumptions:

• A refuge harbour provides safe anchorage or shelter but lacks the full port complex (berths, cargo systems).
• Fishery harbours are purpose-built for fishing fleets and related activities.
• Commercial harbour terminals include administration, customs, and warehousing for cargo handling and compliance.

Concept / Approach:
Refuge harbours focus on safety from storms or emergencies. Fishery harbours optimize berthing and auction/processing for fish landings. Commercial terminals require buildings for regulatory clearance (customs), operations management (administration), and short-term storage (warehouses). Each statement reflects standard industry practice.

Step-by-Step Solution:
Validate (a): A harbour without cargo-handling infrastructure is commonly categorized as a refuge harbour.Validate (b): Naming by primary use is conventional; dedicated facilities for fishing vessels define a fishery harbour.Validate (c): Terminal buildings routinely include admin offices, customs clearance areas, and warehousing to support cargo flow.Since all three are correct, the combined choice is 'all the above'.

Verification / Alternative check:
Port planning manuals and harbour glossaries define these categories similarly; terminal functional blocks repeatedly list administration, customs, and warehousing.

Why Other Options Are Wrong:

• Choosing only one statement omits the fact that all three descriptions are accurate.

Common Pitfalls:

• Confusing a refuge harbour with a marina (recreational focus) or a full-fledged commercial port (cargo focus).
• Assuming customs is optional in commercial terminals—international trade requires it.

Final Answer:
all the above.