The modulus of Rupture of concrete in terms ofits characteristic cube compressive strength $$f_{ck}$$ in Mpa according to 1S456 — 2000 is

A

5000 $$f_{ck}$$

B

0.7 $$f_{ck}$$

C

5000 $$\surd f_{ck}$$

D

0.7 $$\surd f_{ck}$$