With regard to the shear design of RCC beams, which of the following statements is/are TRUE?
- Excessive shear reinforcement can lead to compression failure in concrete
- Beams without shear reinforcement, even if adequately designed for flexure, can have brittle failure
- The main (longitudinal) reinforcement plays no role in the shear resistance of beam
- $\text { As per IS456:2000,}$ the nominal shear stress in the beams of varying depth depends on both the design shear force as well as the design bending moment