The modulus of elasticity, E = 5000 √fck where fck

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The modulus of elasticity, E = 5000 √f_ck where f_ck is the characteristic compressive strength of concrete, specified in IS: 456-2000 is based on

1. tangent modulus
2. initial tangent modules
3. secant modulus
4. chord modulus

Correct Option: B

initial tangent modules