In counterfort type retaining walls i) the vertical slab is designed as a continuous slab ii) the heel slab is designed as a continuous slab iii) the vertical slab is designed as a cantilever iv) the heel slab is designed as a cantilever The correct answer is

• A. (i) and (iv)
• B. (ii) and (iii)
• C. (iii) and (iv)
• D. (i) and (ii)

Answer: (D)