A reinforced concrete beam has an effective depth of 420 mm. As per IS 456 : 2000, what is the maximum permissible spacing of vertical shear stirrups along the beam?

According to IS 456:2000, the minimum percentage of high yield strength deformed (HYSD) bars in an R.C. slab compared with total gross concrete area is:

As per standard civil engineering provisions (IS 456), the nominal clear cover (in mm) to main reinforcement bars in footings, columns, beams, and slabs are respectively: