Choose the correct option for the features of functional mammary gland of all female mammals from the statements below:
i. Glandular tissue with variable amount of fat.
ii. Mammary lobes, 30-40 in number called alveoli
iii. Mammary ducts joining to form mammary tubules.
iv. Mammary ampulla connected to lactiferous duct.

Mammary glands contain significant adipocyte tissues. The glandular tissue of each breast is divided into 15-20 mammary lobes containing clusters of cells
called alveoli. The cells of alveoli secrete milk, which is stored in the cavities (lumens) of alveoli. The alveoli open into mammary tubules. The tubules of each lobe join to form a mammary duct. Several mammary ducts join to form a wider mammary ampulla which is connected to lactiferous duct through which milk is sucked out.