A Patient Was Scheduled for a Laparoscopic Cholecystectomy,but Complications Developed

A patient was scheduled for a laparoscopic cholecystectomy,but complications developed and he underwent an open cholecystectomy with a T tube inserted into the common bile duct.What is the purpose of the T tube?

A) To decompress the duct and relieve pain caused by stimulation of the sphincter of Oddi.
B) To improve diaphragmatic expansion and prevention of atelectasis.
C) To shorten postoperative recovery and hasten the healing process.
D) To keep the duct open and allow drainage of the bile until edema resolves.