A reinforced concrete beam will crack if tensile stress set up in the concrete below the neutral axis is
(a) More than the permissible stress
(b) Less than the permissible stress
(c) Equal to the permissible stress
(d) All the above.
(a) More than the permissible stress
(b) Less than the permissible stress
(c) Equal to the permissible stress
(d) All the above.