Pick up the correct statement from the following:

• The cover of a longitudinal reinforcing bar in a column is kept not less than the diameter of the bar or 40 mm
• The cover of a longitudinal reinforcing bar in beam is kept not less than the diameter of the bar or 25 mm
• The end cover of a longitudinal reinforcing bar in a beam is kept not less than twice the diameter or 25 mm
• The cover for tensile reinforcement in a slab is kept not less than diameter of the bar or 15 mm
• All the above