Which one of the following events takes place during inspiration in man?

Which one of the following events takes place during inspiration in man?
1). The internal intercostals muscles relax
2). Due to contraction of external intercostals muscles and flattening of diaphragm the volume of thoracic cavity increases
3). Due to contraction of external intercostals muscles, and flattening of diaphragm the volume of thoracic cavity decreases
4). The abdominal muscles contract

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