A rainy day as defined by the Indian Meteorological department is a day when the rainfall at a point received is
(a) 0.5 mm to 1 mm in 24 hours
(b) 1.1 mm to 1.5 mm in 24 hours
(c) 1.6 mm to 2 mm in 24 hours
(d) above 2.5 mm in 24 hours
