In a limit state method of design, when shear reinforcement is not provided, the calculated shear stress at the critical section of a slab shall not exceed;
[ A ] Ks 0.25 v fck
[ B ] ks 0.20 v fck
[ C ] ks 0.16 v fck
[ D ] ks 0.10 v fck
[ A ] Ks 0.25 v fck
[ B ] ks 0.20 v fck
[ C ] ks 0.16 v fck
[ D ] ks 0.10 v fck