Which of the following are correct for cover to reinforcement?
1. The reinforcement shall have a minimum clear cover of 20 mm or diameter of such bar whichever is More.
2. At each end of reinforcing bar not less than 25 mm nor less than twice the diameter of such bar
3. Increased cover thickness may be provided when surface of concrete is exposed to the action of harmful chemicals.1
1, 2 and 3
2
1 and 2 only
3
1 and 3 only
4
2 and 3 only