Which of the following attempts are made to reduce the uplift in order to economize on the provided section of a concrete gravity dam?i. Providing drainage gallery to collect seepage waterii. Constructing cut-off under upstream faceiii. Pressure grouting in dam foundationiv. Provision of shear keys or keyways

• A. i and ii
• B. i, ii and iii
• C. i, ii and iv
• D. i, ii, iii and iv