ANS:C - 12

A maximum ratio of span to depth for a cantilever slab of 12 would typically not be recommended in conventional structural design practices. The span-to-depth ratio is a critical factor in the design of slabs, as it affects the structural behavior, deflection, and overall performance of the slab. A higher ratio implies a longer span relative to the thickness of the slab, which can lead to excessive deflections, increased bending moments, and reduced structural stability. In practice, a typical maximum recommended ratio of span to depth for a cantilever slab is usually in the range of 7 to 10. This range helps ensure structural integrity, minimize deflections, and maintain serviceability under expected loads. A ratio of 12 would generally be considered high and could lead to potential structural issues such as excessive deflections, increased risk of cracking, and reduced load-carrying capacity. Therefore, while the exact maximum ratio may vary depending on specific design requirements and codes, a ratio of 12 for a cantilever slab would not typically align with conventional structural engineering principles. It's important to adhere to established design guidelines and consult with a qualified structural engineer for proper design considerations.