A tank of uniform cross-sectional area (A) containing liquid upto height (H1) has an orifice of cross-sectional area (a) at its bottom. The time required to empty the tank completely will be

• A. 2A√H₁)/(Cd × a√2g)
• B. 2AH₁)/(Cd × a√2g)
• C. 2AH₁3/2)/(Cd × a√2g)
• D. 2AH₁²)/(Cd × a√2g)