"Bile is produced by the liver and travels through the cystic duct to be stored in the gallbladder. It is then released from the gallbladder's ducts into the small intestine."

Based on this information, the gallbladder could be classified as which of the following, and why?

Exocrine gland, because bile is delivered through a duct
Endocrine gland, because bile is delivered through a duct
Endocrine gland, because bile does not travel through the blood
Exocrine system, because bile travels through the blood