Minimum clear cover (in mm) to the main steel bars in slab, beam, column and footing respectively, are
(a) 10, 15, 20 and 25 (b) 15, 25, 40 and 75
(c ) 20, 25, 30 and 40 (d) 20, 35, 40 and 75
(a) 10, 15, 20 and 25 (b) 15, 25, 40 and 75
(c ) 20, 25, 30 and 40 (d) 20, 35, 40 and 75