Consider the following statements:1. A braced coffer dam is used in shallow trench excavation as well as in deep excavation exceeding 6 m in depth.2. Coffer dams, braced or un-braced, are temporary structures either on land or in water bodies.3. When sheet piling is used for retaining soil, or soil and water, without any bracing, it is called a bulkhead.Which of the above statements are correct?

• A. 1, 2 and 3
• B. 1 and 2 only
• C. 1 and 3 only
• D. 2 and 3 only