Consider the following four statements (a-d) and select the option which includes all the correct ones only `:-`
(a) All the time of inspiration , contracion in diaphragm and external intercostal muscles take place.
(b) Normal breathing is also called as abdominal breathing.
(c ) Expiration during sneezing, coughing, yoga is normal expiratio during which IICM and abdominal muscles relax.
(d) Inspiration can occur if the pressure within lungs (intra pulmonary pressure) is more than the atmospheric pressure.