As per IS 456, splitting tensile-strength $$(f_{cr})$$ of concrete may be estimated from compressive stength as

A

f_{cr}=0.65 $$\sqrt{f_{ck}}$$

B

f_{cr}=0.7 $$\sqrt{f_{ck}}$$

C

f_{cr}=0.75 $$\sqrt{f_{ck}}$$

D

f_{cr}=0.8 $$\sqrt{f_{ck}}$$