Which of the following are the general design requirements of retaining wall?1. The factor of safety against sliding should be at least 1.52. The factor of safety against over-turning should be at least 2.03. The bearing pressure at toe should be less than the bearing capacity of the soil4. The length of retaining wall to be cast in one go should not exceed 10 m otherwise cracks may develop

• A. 1, 2 and 3 only
• B. 1, 3 and 4 only
• C. 1, 2 and 4 only
• D. 2, 3 and 4 only